71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
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/*
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* altera-lpt.c
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*
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* altera FPGA driver
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*
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* Copyright (C) Altera Corporation 1998-2001
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* Copyright (C) 2010 NetUP Inc.
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* Copyright (C) 2010 Abylay Ospan <aospan@netup.ru>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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*
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include "altera-exprt.h"
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static int lpt_hardware_initialized;
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static void byteblaster_write(int port, int data)
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{
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outb((u8)data, (u16)(port + 0x378));
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};
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static int byteblaster_read(int port)
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{
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int data = 0;
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data = inb((u16)(port + 0x378));
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return data & 0xff;
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};
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int netup_jtag_io_lpt(void *device, int tms, int tdi, int read_tdo)
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{
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int data = 0;
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int tdo = 0;
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int initial_lpt_ctrl = 0;
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if (!lpt_hardware_initialized) {
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initial_lpt_ctrl = byteblaster_read(2);
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byteblaster_write(2, (initial_lpt_ctrl | 0x02) & 0xdf);
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lpt_hardware_initialized = 1;
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}
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data = ((tdi ? 0x40 : 0) | (tms ? 0x02 : 0));
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byteblaster_write(0, data);
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if (read_tdo) {
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tdo = byteblaster_read(1);
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tdo = ((tdo & 0x80) ? 0 : 1);
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}
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byteblaster_write(0, data | 0x01);
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byteblaster_write(0, data);
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return tdo;
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}
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