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/* Blackfin Real Time Clock (RTC) model.
Copyright (C) 2010-2023 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/>. */
/* This must come before any other includes. */
#include "defs.h"
#include <time.h>
#include "sim-main.h"
#include "dv-sockser.h"
#include "devices.h"
#include "dv-bfin_rtc.h"
/* XXX: This read-only stub setup is based on host system clock. */
struct bfin_rtc
{
bu32 base;
bu32 stat_shadow;
/* Order after here is important -- matches hardware MMR layout. */
bu32 stat;
bu16 BFIN_MMR_16(ictl);
bu16 BFIN_MMR_16(istat);
bu16 BFIN_MMR_16(swcnt);
bu32 alarm;
bu16 BFIN_MMR_16(pren);
};
#define mmr_base() offsetof(struct bfin_rtc, stat)
#define mmr_offset(mmr) (offsetof(struct bfin_rtc, mmr) - mmr_base())
static const char * const mmr_names[] =
{
"RTC_STAT", "RTC_ICTL", "RTC_ISTAT", "RTC_SWCNT", "RTC_ALARM", "RTC_PREN",
};
#define mmr_name(off) mmr_names[(off) / 4]
static unsigned
bfin_rtc_io_write_buffer (struct hw *me, const void *source,
int space, address_word addr, unsigned nr_bytes)
{
struct bfin_rtc *rtc = 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 - rtc->base;
valuep = (void *)((uintptr_t)rtc + mmr_base() + mmr_off);
value16p = valuep;
value32p = valuep;
HW_TRACE_WRITE ();
/* XXX: These probably need more work. */
switch (mmr_off)
{
case mmr_offset(stat):
/* XXX: Ignore these since we are wired to host. */
break;
case mmr_offset(istat):
dv_w1c_2 (value16p, value, ~(1 << 14));
break;
case mmr_offset(alarm):
break;
case mmr_offset(ictl):
/* XXX: This should schedule an event handler. */
case mmr_offset(swcnt):
case mmr_offset(pren):
break;
}
return nr_bytes;
}
static unsigned
bfin_rtc_io_read_buffer (struct hw *me, void *dest,
int space, address_word addr, unsigned nr_bytes)
{
struct bfin_rtc *rtc = 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 - rtc->base;
valuep = (void *)((uintptr_t)rtc + mmr_base() + mmr_off);
value16p = valuep;
value32p = valuep;
HW_TRACE_READ ();
switch (mmr_off)
{
case mmr_offset(stat):
{
time_t t = time (NULL);
struct tm *tm = localtime (&t);
bu32 value =
(((tm->tm_year - 70) * 365 + tm->tm_yday) << 17) |
(tm->tm_hour << 12) |
(tm->tm_min << 6) |
(tm->tm_sec << 0);
dv_store_4 (dest, value);
break;
}
case mmr_offset(alarm):
dv_store_4 (dest, *value32p);
break;
case mmr_offset(istat):
case mmr_offset(ictl):
case mmr_offset(swcnt):
case mmr_offset(pren):
dv_store_2 (dest, *value16p);
break;
}
return nr_bytes;
}
static const struct hw_port_descriptor bfin_rtc_ports[] =
{
{ "rtc", 0, 0, output_port, },
{ NULL, 0, 0, 0, },
};
static void
attach_bfin_rtc_regs (struct hw *me, struct bfin_rtc *rtc)
{
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_RTC_SIZE)
hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_RTC_SIZE);
hw_attach_address (hw_parent (me),
0, attach_space, attach_address, attach_size, me);
rtc->base = attach_address;
}
static void
bfin_rtc_finish (struct hw *me)
{
struct bfin_rtc *rtc;
rtc = HW_ZALLOC (me, struct bfin_rtc);
set_hw_data (me, rtc);
set_hw_io_read_buffer (me, bfin_rtc_io_read_buffer);
set_hw_io_write_buffer (me, bfin_rtc_io_write_buffer);
set_hw_ports (me, bfin_rtc_ports);
attach_bfin_rtc_regs (me, rtc);
/* Initialize the RTC. */
}
const struct hw_descriptor dv_bfin_rtc_descriptor[] =
{
{"bfin_rtc", bfin_rtc_finish,},
{NULL, NULL},
};
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