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altera-lpt.c
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1 /*
2  * altera-lpt.c
3  *
4  * altera FPGA driver
5  *
6  * Copyright (C) Altera Corporation 1998-2001
7  * Copyright (C) 2010 NetUP Inc.
8  * Copyright (C) 2010 Abylay Ospan <[email protected]>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  *
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25 
26 #include <linux/io.h>
27 #include <linux/kernel.h>
28 #include "altera-exprt.h"
29 
30 static int lpt_hardware_initialized;
31 
32 static void byteblaster_write(int port, int data)
33 {
34  outb((u8)data, (u16)(port + 0x378));
35 };
36 
37 static int byteblaster_read(int port)
38 {
39  int data = 0;
40  data = inb((u16)(port + 0x378));
41  return data & 0xff;
42 };
43 
44 int netup_jtag_io_lpt(void *device, int tms, int tdi, int read_tdo)
45 {
46  int data = 0;
47  int tdo = 0;
48  int initial_lpt_ctrl = 0;
49 
50  if (!lpt_hardware_initialized) {
51  initial_lpt_ctrl = byteblaster_read(2);
52  byteblaster_write(2, (initial_lpt_ctrl | 0x02) & 0xdf);
53  lpt_hardware_initialized = 1;
54  }
55 
56  data = ((tdi ? 0x40 : 0) | (tms ? 0x02 : 0));
57 
58  byteblaster_write(0, data);
59 
60  if (read_tdo) {
61  tdo = byteblaster_read(1);
62  tdo = ((tdo & 0x80) ? 0 : 1);
63  }
64 
65  byteblaster_write(0, data | 0x01);
66 
67  byteblaster_write(0, data);
68 
69  return tdo;
70 }