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/* Blackfin Watchdog (WDOG) model.
Copyright (C) 2010-2019 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 "dv-sockser.h"
#include "devices.h"
#include "dv-bfin_wdog.h"
/* XXX: Should we bother emulating the TX/RX FIFOs ? */
struct bfin_wdog
{
bu32 base;
/* Order after here is important -- matches hardware MMR layout. */
bu16 BFIN_MMR_16(ctl);
bu32 cnt, stat;
};
#define mmr_base() offsetof(struct bfin_wdog, ctl)
#define mmr_offset(mmr) (offsetof(struct bfin_wdog, mmr) - mmr_base())
static const char * const mmr_names[] =
{
"WDOG_CTL", "WDOG_CNT", "WDOG_STAT",
};
#define mmr_name(off) mmr_names[(off) / 4]
static bool
bfin_wdog_enabled (struct bfin_wdog *wdog)
{
return ((wdog->ctl & WDEN) != WDDIS);
}
static unsigned
bfin_wdog_io_write_buffer (struct hw *me, const void *source,
int space, address_word addr, unsigned nr_bytes)
{
struct bfin_wdog *wdog = hw_data (me);
bu32 mmr_off;
bu32 value;
bu16 *value16p;
bu32 *value32p;
void *valuep;
/* Invalid access mode is higher priority than missing register. */
if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, true))
return 0;
if (nr_bytes == 4)
value = dv_load_4 (source);
else
value = dv_load_2 (source);
mmr_off = addr - wdog->base;
valuep = (void *)((unsigned long)wdog + mmr_base() + mmr_off);
value16p = valuep;
value32p = valuep;
HW_TRACE_WRITE ();
switch (mmr_off)
{
case mmr_offset(ctl):
dv_w1c_2_partial (value16p, value, WDRO);
/* XXX: Should enable an event here to handle timeouts. */
break;
case mmr_offset(cnt):
/* Writes are discarded when enabeld. */
if (!bfin_wdog_enabled (wdog))
{
*value32p = value;
/* Writes to CNT preloads the STAT. */
wdog->stat = wdog->cnt;
}
break;
case mmr_offset(stat):
/* When enabled, writes to STAT reload the counter. */
if (bfin_wdog_enabled (wdog))
wdog->stat = wdog->cnt;
/* XXX: When disabled, are writes just ignored ? */
break;
}
return nr_bytes;
}
static unsigned
bfin_wdog_io_read_buffer (struct hw *me, void *dest,
int space, address_word addr, unsigned nr_bytes)
{
struct bfin_wdog *wdog = hw_data (me);
bu32 mmr_off;
bu16 *value16p;
bu32 *value32p;
void *valuep;
/* Invalid access mode is higher priority than missing register. */
if (!dv_bfin_mmr_require_16_32 (me, addr, nr_bytes, false))
return 0;
mmr_off = addr - wdog->base;
valuep = (void *)((unsigned long)wdog + mmr_base() + mmr_off);
value16p = valuep;
value32p = valuep;
HW_TRACE_READ ();
switch (mmr_off)
{
case mmr_offset(ctl):
if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
return 0;
dv_store_2 (dest, *value16p);
break;
case mmr_offset(cnt):
case mmr_offset(stat):
dv_store_4 (dest, *value32p);
break;
}
return nr_bytes;
}
static const struct hw_port_descriptor bfin_wdog_ports[] =
{
{ "reset", WDEV_RESET, 0, output_port, },
{ "nmi", WDEV_NMI, 0, output_port, },
{ "gpi", WDEV_GPI, 0, output_port, },
{ NULL, 0, 0, 0, },
};
static void
bfin_wdog_port_event (struct hw *me, int my_port, struct hw *source,
int source_port, int level)
{
struct bfin_wdog *wdog = hw_data (me);
bu16 wdev;
wdog->ctl |= WDRO;
wdev = (wdog->ctl & WDEV);
if (wdev != WDEV_NONE)
hw_port_event (me, wdev, 1);
}
static void
attach_bfin_wdog_regs (struct hw *me, struct bfin_wdog *wdog)
{
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_MMR_WDOG_SIZE)
hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_WDOG_SIZE);
hw_attach_address (hw_parent (me),
0, attach_space, attach_address, attach_size, me);
wdog->base = attach_address;
}
static void
bfin_wdog_finish (struct hw *me)
{
struct bfin_wdog *wdog;
wdog = HW_ZALLOC (me, struct bfin_wdog);
set_hw_data (me, wdog);
set_hw_io_read_buffer (me, bfin_wdog_io_read_buffer);
set_hw_io_write_buffer (me, bfin_wdog_io_write_buffer);
set_hw_ports (me, bfin_wdog_ports);
set_hw_port_event (me, bfin_wdog_port_event);
attach_bfin_wdog_regs (me, wdog);
/* Initialize the Watchdog. */
wdog->ctl = WDDIS;
}
const struct hw_descriptor dv_bfin_wdog_descriptor[] =
{
{"bfin_wdog", bfin_wdog_finish,},
{NULL, NULL},
};
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