diff options
Diffstat (limited to 'drivers/misc/altera-stapl/altera-lpt.c')
-rw-r--r-- | drivers/misc/altera-stapl/altera-lpt.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/misc/altera-stapl/altera-lpt.c b/drivers/misc/altera-stapl/altera-lpt.c new file mode 100644 index 0000000000..2b7d9cf415 --- /dev/null +++ b/drivers/misc/altera-stapl/altera-lpt.c @@ -0,0 +1,56 @@ +// 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; +} |