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 <aospan@netup.ru> 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 } 71