1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * altera-lpt.c 4 * 5 * altera FPGA driver 6 * 7 * Copyright (C) Altera Corporation 1998-2001 8 * Copyright (C) 2010 NetUP Inc. 9 * Copyright (C) 2010 Abylay Ospan <aospan@netup.ru> 10 */ 11 12 #include <linux/io.h> 13 #include <linux/kernel.h> 14 #include "altera-exprt.h" 15 16 static int lpt_hardware_initialized; 17 18 static void byteblaster_write(int port, int data) 19 { 20 outb((u8)data, (u16)(port + 0x378)); 21 }; 22 23 static int byteblaster_read(int port) 24 { 25 int data = 0; 26 data = inb((u16)(port + 0x378)); 27 return data & 0xff; 28 }; 29 30 int netup_jtag_io_lpt(void *device, int tms, int tdi, int read_tdo) 31 { 32 int data = 0; 33 int tdo = 0; 34 int initial_lpt_ctrl = 0; 35 36 if (!lpt_hardware_initialized) { 37 initial_lpt_ctrl = byteblaster_read(2); 38 byteblaster_write(2, (initial_lpt_ctrl | 0x02) & 0xdf); 39 lpt_hardware_initialized = 1; 40 } 41 42 data = ((tdi ? 0x40 : 0) | (tms ? 0x02 : 0)); 43 44 byteblaster_write(0, data); 45 46 if (read_tdo) { 47 tdo = byteblaster_read(1); 48 tdo = ((tdo & 0x80) ? 0 : 1); 49 } 50 51 byteblaster_write(0, data | 0x01); 52 53 byteblaster_write(0, data); 54 55 return tdo; 56 } 57