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git.ipfire.org Git - thirdparty/kernel/stable.git/blob - drivers/ata/pata_parport/on26.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * (c) 1997-1998 Grant R. Guenther <grant@torque.net>
5 * on26.c is a low-level protocol driver for the
6 * OnSpec 90c26 parallel to IDE adapter chip.
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/delay.h>
12 #include <linux/kernel.h>
13 #include <linux/types.h>
14 #include <linux/wait.h>
16 #include "pata_parport.h"
19 * mode codes: 0 nybble reads, 8-bit writes
20 * 1 8-bit reads and writes
26 #define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0))
30 w2(5); w2(0xd); w2(5); w2(0xd); w2(5); w2(4); \
35 w2(5); w2(7); w2(5); w2(4); \
39 * cont = 0 - access the IDE register file
40 * cont = 1 - access the IDE command set
43 static int on26_read_regr(struct pi_adapter
*pi
, int cont
, int regr
)
47 r
= (regr
<< 2) + 1 + cont
;
51 w0(1); P1
; w0(r
); P2
; w0(0); P1
;
52 w2(6); a
= r1(); w2(4);
53 w2(6); b
= r1(); w2(4);
54 w2(6); w2(4); w2(6); w2(4);
57 w0(1); P1
; w0(r
); P2
; w0(0); P1
;
58 w2(0x26); a
= r0(); w2(4); w2(0x26); w2(4);
63 w3(1); w3(1); w2(5); w4(r
); w2(4);
64 w3(0); w3(0); w2(0x24); a
= r4(); w2(4);
65 w2(0x24); (void)r4(); w2(4);
72 static void on26_write_regr(struct pi_adapter
*pi
, int cont
, int regr
, int val
)
74 int r
= (regr
<< 2) + 1 + cont
;
79 w0(1); P1
; w0(r
); P2
; w0(0); P1
;
80 w0(val
); P2
; w0(val
); P2
;
85 w3(1); w3(1); w2(5); w4(r
); w2(4);
87 w2(5); w4(val
); w2(4);
88 w2(5); w4(val
); w2(4);
95 w0(0xfe); w0(0xaa); w0(0x55); w0(0); \
96 w0(0xff); w0(0x87); w0(0x78); w0(x); \
97 w2(4); w2(5); w2(4); w0(0xff); \
100 static void on26_connect(struct pi_adapter
*pi
)
113 w0(2); P1
; w0(8); P2
;
114 w0(2); P1
; w0(x
); P2
;
117 static void on26_disconnect(struct pi_adapter
*pi
)
120 w3(4); w3(4); w3(4); w3(4);
122 w0(4); P1
; w0(4); P1
;
129 #define RESET_WAIT 200
132 static int on26_test_port(struct pi_adapter
*pi
)
134 int i
, m
, d
, x
= 0, y
= 0;
148 w0(0xfe); w0(0xaa); w0(0x55); w0(0); w0(0xff);
149 i
= ((r1() & 0xf0) << 4); w0(0x87);
150 i
|= (r1() & 0xf0); w0(0x78);
151 w0(0x20); w2(4); w2(5);
152 i
|= ((r1() & 0xf0) >> 4);
156 w0(2); P1
; w0(0); P2
;
157 w0(3); P1
; w0(0); P2
;
158 w0(2); P1
; w0(8); P2
; udelay(100);
159 w0(2); P1
; w0(0xa); P2
; udelay(100);
160 w0(2); P1
; w0(8); P2
; udelay(1000);
162 on26_write_regr(pi
, 0, 6, 0xa0);
164 for (i
= 0; i
< RESET_WAIT
; i
++) {
165 on26_write_regr(pi
, 0, 6, 0xa0);
166 x
= on26_read_regr(pi
, 0, 7);
167 on26_write_regr(pi
, 0, 6, 0xb0);
168 y
= on26_read_regr(pi
, 0, 7);
169 if (!((x
& 0x80) || (y
& 0x80)))
176 "on26: Device reset failed (%x,%x)\n", x
, y
);
178 w0(4); P1
; w0(4); P1
;
191 static void on26_read_block(struct pi_adapter
*pi
, char *buf
, int count
)
197 w0(1); P1
; w0(1); P2
; w0(2); P1
; w0(0x18); P2
; w0(0); P1
;
199 for (k
= 0; k
< count
; k
++) {
204 w0(2); P1
; w0(8); P2
;
207 w0(1); P1
; w0(1); P2
; w0(2); P1
; w0(0x19); P2
; w0(0); P1
;
209 for (k
= 0; k
< count
/ 2; k
++) {
210 w2(0x26); buf
[2 * k
] = r0();
211 w2(0x24); buf
[2 * k
+ 1] = r0();
213 w0(2); P1
; w0(9); P2
;
216 w3(1); w3(1); w2(5); w4(1); w2(4);
217 w3(0); w3(0); w2(0x24);
219 for (k
= 0; k
< count
; k
++)
224 w3(1); w3(1); w2(5); w4(1); w2(4);
225 w3(0); w3(0); w2(0x24);
227 for (k
= 0; k
< count
/ 2; k
++)
228 ((u16
*)buf
)[k
] = r4w();
232 w3(1); w3(1); w2(5); w4(1); w2(4);
233 w3(0); w3(0); w2(0x24);
235 for (k
= 0; k
< count
/ 4; k
++)
236 ((u32
*)buf
)[k
] = r4l();
242 static void on26_write_block(struct pi_adapter
*pi
, char *buf
, int count
)
249 w0(1); P1
; w0(1); P2
;
250 w0(2); P1
; w0(0x18 + pi
->mode
); P2
; w0(0); P1
;
252 for (k
= 0; k
< count
/ 2; k
++) {
253 w2(5); w0(buf
[2 * k
]);
254 w2(7); w0(buf
[2 * k
+ 1]);
257 w0(2); P1
; w0(8 + pi
->mode
); P2
;
260 w3(1); w3(1); w2(5); w4(1); w2(4);
261 w3(0); w3(0); w2(0xc5);
263 for (k
= 0; k
< count
; k
++)
268 w3(1); w3(1); w2(5); w4(1); w2(4);
269 w3(0); w3(0); w2(0xc5);
271 for (k
= 0; k
< count
/ 2; k
++)
272 w4w(((u16
*)buf
)[k
]);
276 w3(1); w3(1); w2(5); w4(1); w2(4);
277 w3(0); w3(0); w2(0xc5);
279 for (k
= 0; k
< count
/ 4; k
++)
280 w4l(((u32
*)buf
)[k
]);
286 static void on26_log_adapter(struct pi_adapter
*pi
)
288 char *mode_string
[5] = { "4-bit", "8-bit", "EPP-8", "EPP-16", "EPP-32" };
291 "OnSpec 90c26 at 0x%x, mode %d (%s), delay %d\n",
292 pi
->port
, pi
->mode
, mode_string
[pi
->mode
], pi
->delay
);
295 static struct pi_protocol on26
= {
296 .owner
= THIS_MODULE
,
302 .write_regr
= on26_write_regr
,
303 .read_regr
= on26_read_regr
,
304 .write_block
= on26_write_block
,
305 .read_block
= on26_read_block
,
306 .connect
= on26_connect
,
307 .disconnect
= on26_disconnect
,
308 .test_port
= on26_test_port
,
309 .log_adapter
= on26_log_adapter
,
312 MODULE_LICENSE("GPL");
313 MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>");
314 MODULE_DESCRIPTION("Onspec 90c26 parallel port IDE adapter protocol driver");
315 module_pata_parport_driver(on26
);