1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * (c) 1998 Grant R. Guenther <grant@torque.net> |
4 | * |
5 | * ktti.c is a low-level protocol driver for the KT Technology |
6 | * parallel port adapter. This adapter is used in the "PHd" |
7 | * portable hard-drives. As far as I can tell, this device |
8 | * supports 4-bit mode _only_. |
9 | */ |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/delay.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/types.h> |
16 | #include <linux/wait.h> |
17 | #include <asm/io.h> |
18 | #include "pata_parport.h" |
19 | |
20 | #define j44(a, b) (((a >> 4) & 0x0f) | (b & 0xf0)) |
21 | |
22 | /* |
23 | * cont = 0 - access the IDE register file |
24 | * cont = 1 - access the IDE command set |
25 | */ |
26 | static int cont_map[2] = { 0x10, 0x08 }; |
27 | |
28 | static void ktti_write_regr(struct pi_adapter *pi, int cont, int regr, int val) |
29 | { |
30 | int r = regr + cont_map[cont]; |
31 | |
32 | w0(r); w2(0xb); w2(0xa); w2(3); w2(6); |
33 | w0(val); w2(3); w0(0); w2(6); w2(0xb); |
34 | } |
35 | |
36 | static int ktti_read_regr(struct pi_adapter *pi, int cont, int regr) |
37 | { |
38 | int a, b, r; |
39 | |
40 | r = regr + cont_map[cont]; |
41 | |
42 | w0(r); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9); |
43 | a = r1(); w2(0xc); b = r1(); w2(9); w2(0xc); w2(9); |
44 | return j44(a, b); |
45 | } |
46 | |
47 | static void ktti_read_block(struct pi_adapter *pi, char *buf, int count) |
48 | { |
49 | int k, a, b; |
50 | |
51 | for (k = 0; k < count / 2; k++) { |
52 | w0(0x10); w2(0xb); w2(0xa); w2(9); w2(0xc); w2(9); |
53 | a = r1(); w2(0xc); b = r1(); w2(9); |
54 | buf[2*k] = j44(a, b); |
55 | a = r1(); w2(0xc); b = r1(); w2(9); |
56 | buf[2*k+1] = j44(a, b); |
57 | } |
58 | } |
59 | |
60 | static void ktti_write_block(struct pi_adapter *pi, char *buf, int count) |
61 | { |
62 | int k; |
63 | |
64 | for (k = 0; k < count / 2; k++) { |
65 | w0(0x10); w2(0xb); w2(0xa); w2(3); w2(6); |
66 | w0(buf[2 * k]); w2(3); |
67 | w0(buf[2 * k + 1]); w2(6); |
68 | w2(0xb); |
69 | } |
70 | } |
71 | |
72 | static void ktti_connect(struct pi_adapter *pi) |
73 | { |
74 | pi->saved_r0 = r0(); |
75 | pi->saved_r2 = r2(); |
76 | w2(0xb); w2(0xa); w0(0); w2(3); w2(6); |
77 | } |
78 | |
79 | static void ktti_disconnect(struct pi_adapter *pi) |
80 | { |
81 | w2(0xb); w2(0xa); w0(0xa0); w2(3); w2(4); |
82 | w0(pi->saved_r0); |
83 | w2(pi->saved_r2); |
84 | } |
85 | |
86 | static void ktti_log_adapter(struct pi_adapter *pi) |
87 | { |
88 | dev_info(&pi->dev, "KT adapter at 0x%x, delay %d\n" , |
89 | pi->port, pi->delay); |
90 | } |
91 | |
92 | static struct pi_protocol ktti = { |
93 | .owner = THIS_MODULE, |
94 | .name = "ktti" , |
95 | .max_mode = 1, |
96 | .epp_first = 2, |
97 | .default_delay = 1, |
98 | .max_units = 1, |
99 | .write_regr = ktti_write_regr, |
100 | .read_regr = ktti_read_regr, |
101 | .write_block = ktti_write_block, |
102 | .read_block = ktti_read_block, |
103 | .connect = ktti_connect, |
104 | .disconnect = ktti_disconnect, |
105 | .log_adapter = ktti_log_adapter, |
106 | }; |
107 | |
108 | MODULE_LICENSE("GPL" ); |
109 | MODULE_AUTHOR("Grant R. Guenther <grant@torque.net>" ); |
110 | MODULE_DESCRIPTION("KT Technology parallel port IDE adapter protocol driver" ); |
111 | module_pata_parport_driver(ktti); |
112 | |