// SPDX-License-Identifier: GPL-2.0-or-later /* * altera-lpt.c * * altera FPGA driver * * Copyright (C) Altera Corporation 1998-2001 * Copyright (C) 2010 NetUP Inc. * Copyright (C) 2010 Abylay Ospan <aospan@netup.ru> */ #include <linux/io.h> #include <linux/kernel.h> #include "altera-exprt.h" static int lpt_hardware_initialized; static void byteblaster_write(int port, int data) { outb((u8)data, (u16)(port + 0x378)); }; static int byteblaster_read(int port) { int data = 0; data = inb((u16)(port + 0x378)); return data & 0xff; }; int netup_jtag_io_lpt(void *device, int tms, int tdi, int read_tdo) { int data = 0; int tdo = 0; int initial_lpt_ctrl = 0; if (!lpt_hardware_initialized) { initial_lpt_ctrl = byteblaster_read(2); byteblaster_write(2, (initial_lpt_ctrl | 0x02) & 0xdf); lpt_hardware_initialized = 1; } data = ((tdi ? 0x40 : 0) | (tms ? 0x02 : 0)); byteblaster_write(0, data); if (read_tdo) { tdo = byteblaster_read(1); tdo = ((tdo & 0x80) ? 0 : 1); } byteblaster_write(0, data | 0x01); byteblaster_write(0, data); return tdo; }