160 lines
4.0 KiB
C
160 lines
4.0 KiB
C
/* Blackfin JTAG model.
|
|
|
|
Copyright (C) 2010-2015 Free Software Foundation, Inc.
|
|
Contributed by Analog Devices, Inc.
|
|
|
|
This file is part of simulators.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "config.h"
|
|
|
|
#include "sim-main.h"
|
|
#include "devices.h"
|
|
#include "dv-bfin_jtag.h"
|
|
|
|
/* XXX: This is mostly a stub. There are more registers, but they're only
|
|
accessible via the JTAG scan chain and not the MMR interface. */
|
|
|
|
struct bfin_jtag
|
|
{
|
|
bu32 base;
|
|
|
|
/* Order after here is important -- matches hardware MMR layout. */
|
|
bu32 dspid;
|
|
bu32 _pad0;
|
|
bu32 dbgstat;
|
|
};
|
|
#define mmr_base() offsetof(struct bfin_jtag, dspid)
|
|
#define mmr_offset(mmr) (offsetof(struct bfin_jtag, mmr) - mmr_base())
|
|
|
|
static const char * const mmr_names[] =
|
|
{
|
|
"DSPID", NULL, "DBGSTAT",
|
|
};
|
|
#define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>")
|
|
|
|
static unsigned
|
|
bfin_jtag_io_write_buffer (struct hw *me, const void *source, int space,
|
|
address_word addr, unsigned nr_bytes)
|
|
{
|
|
struct bfin_jtag *jtag = hw_data (me);
|
|
bu32 mmr_off;
|
|
bu32 value;
|
|
bu32 *valuep;
|
|
|
|
value = dv_load_4 (source);
|
|
mmr_off = addr - jtag->base;
|
|
valuep = (void *)((unsigned long)jtag + mmr_base() + mmr_off);
|
|
|
|
HW_TRACE_WRITE ();
|
|
|
|
switch (mmr_off)
|
|
{
|
|
case mmr_offset(dbgstat):
|
|
dv_w1c_4 (valuep, value, 0xc);
|
|
break;
|
|
case mmr_offset(dspid):
|
|
/* Discard writes to these. */
|
|
break;
|
|
default:
|
|
dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
|
|
break;
|
|
}
|
|
|
|
return nr_bytes;
|
|
}
|
|
|
|
static unsigned
|
|
bfin_jtag_io_read_buffer (struct hw *me, void *dest, int space,
|
|
address_word addr, unsigned nr_bytes)
|
|
{
|
|
struct bfin_jtag *jtag = hw_data (me);
|
|
bu32 mmr_off;
|
|
bu32 value;
|
|
bu32 *valuep;
|
|
|
|
mmr_off = addr - jtag->base;
|
|
valuep = (void *)((unsigned long)jtag + mmr_base() + mmr_off);
|
|
|
|
HW_TRACE_READ ();
|
|
|
|
switch (mmr_off)
|
|
{
|
|
case mmr_offset(dbgstat):
|
|
case mmr_offset(dspid):
|
|
value = *valuep;
|
|
break;
|
|
default:
|
|
while (1) /* Core MMRs -> exception -> doesn't return. */
|
|
dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
|
|
break;
|
|
}
|
|
|
|
dv_store_4 (dest, value);
|
|
|
|
return nr_bytes;
|
|
}
|
|
|
|
static void
|
|
attach_bfin_jtag_regs (struct hw *me, struct bfin_jtag *jtag)
|
|
{
|
|
address_word attach_address;
|
|
int attach_space;
|
|
unsigned attach_size;
|
|
reg_property_spec reg;
|
|
|
|
if (hw_find_property (me, "reg") == NULL)
|
|
hw_abort (me, "Missing \"reg\" property");
|
|
|
|
if (!hw_find_reg_array_property (me, "reg", 0, ®))
|
|
hw_abort (me, "\"reg\" property must contain three addr/size entries");
|
|
|
|
hw_unit_address_to_attach_address (hw_parent (me),
|
|
®.address,
|
|
&attach_space, &attach_address, me);
|
|
hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me);
|
|
|
|
if (attach_size != BFIN_COREMMR_JTAG_SIZE)
|
|
hw_abort (me, "\"reg\" size must be %#x", BFIN_COREMMR_JTAG_SIZE);
|
|
|
|
hw_attach_address (hw_parent (me),
|
|
0, attach_space, attach_address, attach_size, me);
|
|
|
|
jtag->base = attach_address;
|
|
}
|
|
|
|
static void
|
|
bfin_jtag_finish (struct hw *me)
|
|
{
|
|
struct bfin_jtag *jtag;
|
|
|
|
jtag = HW_ZALLOC (me, struct bfin_jtag);
|
|
|
|
set_hw_data (me, jtag);
|
|
set_hw_io_read_buffer (me, bfin_jtag_io_read_buffer);
|
|
set_hw_io_write_buffer (me, bfin_jtag_io_write_buffer);
|
|
|
|
attach_bfin_jtag_regs (me, jtag);
|
|
|
|
/* Initialize the JTAG state. */
|
|
jtag->dspid = bfin_model_get_dspid (hw_system (me));
|
|
}
|
|
|
|
const struct hw_descriptor dv_bfin_jtag_descriptor[] =
|
|
{
|
|
{"bfin_jtag", bfin_jtag_finish,},
|
|
{NULL, NULL},
|
|
};
|