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/* Blackfin General Purpose Timers (GPtimer) 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 "sim-main.h"
#include "devices.h"
#include "dv-bfin_gptimer.h"
/* XXX: This is merely a stub. */
struct bfin_gptimer
{
/* This top portion matches common dv_bfin struct. */
bu32 base;
struct hw *dma_master;
bool acked;
struct hw_event *handler;
char saved_byte;
int saved_count;
/* Order after here is important -- matches hardware MMR layout. */
bu16 BFIN_MMR_16(config);
bu32 counter, period, width;
};
#define mmr_base() offsetof(struct bfin_gptimer, config)
#define mmr_offset(mmr) (offsetof(struct bfin_gptimer, mmr) - mmr_base())
static const char * const mmr_names[] =
{
"TIMER_CONFIG", "TIMER_COUNTER", "TIMER_PERIOD", "TIMER_WIDTH",
};
#define mmr_name(off) mmr_names[(off) / 4]
static unsigned
bfin_gptimer_io_write_buffer (struct hw *me, const void *source, int space,
address_word addr, unsigned nr_bytes)
{
struct bfin_gptimer *gptimer = 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 - gptimer->base;
valuep = (void *)((uintptr_t)gptimer + mmr_base() + mmr_off);
value16p = valuep;
value32p = valuep;
HW_TRACE_WRITE ();
switch (mmr_off)
{
case mmr_offset(config):
if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
return 0;
*value16p = value;
break;
case mmr_offset(counter):
case mmr_offset(period):
case mmr_offset(width):
if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
return 0;
*value32p = value;
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
return 0;
}
return nr_bytes;
}
static unsigned
bfin_gptimer_io_read_buffer (struct hw *me, void *dest, int space,
address_word addr, unsigned nr_bytes)
{
struct bfin_gptimer *gptimer = 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 - gptimer->base;
valuep = (void *)((uintptr_t)gptimer + mmr_base() + mmr_off);
value16p = valuep;
value32p = valuep;
HW_TRACE_READ ();
switch (mmr_off)
{
case mmr_offset(config):
if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
return 0;
dv_store_2 (dest, *value16p);
break;
case mmr_offset(counter):
case mmr_offset(period):
case mmr_offset(width):
if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
return 0;
dv_store_4 (dest, *value32p);
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
return 0;
}
return nr_bytes;
}
static const struct hw_port_descriptor bfin_gptimer_ports[] =
{
{ "stat", 0, 0, output_port, },
{ NULL, 0, 0, 0, },
};
static void
attach_bfin_gptimer_regs (struct hw *me, struct bfin_gptimer *gptimer)
{
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_GPTIMER_SIZE)
hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPTIMER_SIZE);
hw_attach_address (hw_parent (me),
0, attach_space, attach_address, attach_size, me);
gptimer->base = attach_address;
}
static void
bfin_gptimer_finish (struct hw *me)
{
struct bfin_gptimer *gptimer;
gptimer = HW_ZALLOC (me, struct bfin_gptimer);
set_hw_data (me, gptimer);
set_hw_io_read_buffer (me, bfin_gptimer_io_read_buffer);
set_hw_io_write_buffer (me, bfin_gptimer_io_write_buffer);
set_hw_ports (me, bfin_gptimer_ports);
attach_bfin_gptimer_regs (me, gptimer);
}
const struct hw_descriptor dv_bfin_gptimer_descriptor[] =
{
{"bfin_gptimer", bfin_gptimer_finish,},
{NULL, NULL},
};
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