blob: bbcc54f0fb5450d794dcc4f02a9bb212a56a4bf7 [file] [log] [blame]
/* Blackfin General Purpose Ports (GPIO) model
Copyright (C) 2010-2021 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_gpio.h"
struct bfin_gpio
{
bu32 base;
bu16 int_state;
/* Order after here is important -- matches hardware MMR layout. */
bu16 BFIN_MMR_16(data);
bu16 BFIN_MMR_16(clear);
bu16 BFIN_MMR_16(set);
bu16 BFIN_MMR_16(toggle);
bu16 BFIN_MMR_16(maska);
bu16 BFIN_MMR_16(maska_clear);
bu16 BFIN_MMR_16(maska_set);
bu16 BFIN_MMR_16(maska_toggle);
bu16 BFIN_MMR_16(maskb);
bu16 BFIN_MMR_16(maskb_clear);
bu16 BFIN_MMR_16(maskb_set);
bu16 BFIN_MMR_16(maskb_toggle);
bu16 BFIN_MMR_16(dir);
bu16 BFIN_MMR_16(polar);
bu16 BFIN_MMR_16(edge);
bu16 BFIN_MMR_16(both);
bu16 BFIN_MMR_16(inen);
};
#define mmr_base() offsetof(struct bfin_gpio, data)
#define mmr_offset(mmr) (offsetof(struct bfin_gpio, mmr) - mmr_base())
static const char * const mmr_names[] =
{
"PORTIO", "PORTIO_CLEAR", "PORTIO_SET", "PORTIO_TOGGLE", "PORTIO_MASKA",
"PORTIO_MASKA_CLEAR", "PORTIO_MASKA_SET", "PORTIO_MASKA_TOGGLE",
"PORTIO_MASKB", "PORTIO_MASKB_CLEAR", "PORTIO_MASKB_SET",
"PORTIO_MASKB_TOGGLE", "PORTIO_DIR", "PORTIO_POLAR", "PORTIO_EDGE",
"PORTIO_BOTH", "PORTIO_INEN",
};
#define mmr_name(off) mmr_names[(off) / 4]
static void
bfin_gpio_forward_int (struct hw *me, struct bfin_gpio *port, bu32 mask,
int dst_port)
{
HW_TRACE ((me, "resending levels on port %c", 'a' + dst_port));
hw_port_event (me, dst_port, !!(port->int_state & mask));
}
static void
bfin_gpio_forward_ints (struct hw *me, struct bfin_gpio *port)
{
bfin_gpio_forward_int (me, port, port->maska, 0);
bfin_gpio_forward_int (me, port, port->maskb, 1);
}
static void
bfin_gpio_forward_ouput (struct hw *me, struct bfin_gpio *port, bu32 odata)
{
int pin, value, ovalue, bit;
for (pin = 0; pin < 16; ++pin)
{
bit = 1 << pin;
/* Make sure this is an output pin. */
if (!(port->dir & bit))
continue;
/* Only signal port if the pin changes value. */
value = !!(port->data & bit);
ovalue = !!(odata & bit);
if (value == ovalue)
continue;
HW_TRACE ((me, "outputting gpio %i changed to %i", pin, value));
hw_port_event (me, pin, value);
}
}
static unsigned
bfin_gpio_io_write_buffer (struct hw *me, const void *source, int space,
address_word addr, unsigned nr_bytes)
{
struct bfin_gpio *port = hw_data (me);
bu32 mmr_off;
bu16 value;
bu16 *valuep;
bu32 data = port->data;
/* Invalid access mode is higher priority than missing register. */
if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, true))
return 0;
value = dv_load_2 (source);
mmr_off = addr - port->base;
valuep = (void *)((unsigned long)port + mmr_base() + mmr_off);
HW_TRACE_WRITE ();
switch (mmr_off)
{
case mmr_offset(data):
case mmr_offset(maska):
case mmr_offset(maskb):
case mmr_offset(dir):
case mmr_offset(polar):
case mmr_offset(edge):
case mmr_offset(both):
case mmr_offset(inen):
*valuep = value;
break;
case mmr_offset(clear):
case mmr_offset(maska_clear):
case mmr_offset(maskb_clear):
/* We want to clear the related data MMR. */
valuep -= 2;
dv_w1c_2 (valuep, value, -1);
break;
case mmr_offset(set):
case mmr_offset(maska_set):
case mmr_offset(maskb_set):
/* We want to set the related data MMR. */
valuep -= 4;
*valuep |= value;
break;
case mmr_offset(toggle):
case mmr_offset(maska_toggle):
case mmr_offset(maskb_toggle):
/* We want to toggle the related data MMR. */
valuep -= 6;
*valuep ^= value;
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
return 0;
}
/* If updating masks, make sure we send updated port info. */
switch (mmr_off)
{
case mmr_offset(dir):
case mmr_offset(data) ... mmr_offset(toggle):
bfin_gpio_forward_ouput (me, port, data);
break;
case mmr_offset(maska) ... mmr_offset(maska_toggle):
bfin_gpio_forward_int (me, port, port->maska, 0);
break;
case mmr_offset(maskb) ... mmr_offset(maskb_toggle):
bfin_gpio_forward_int (me, port, port->maskb, 1);
break;
}
return nr_bytes;
}
static unsigned
bfin_gpio_io_read_buffer (struct hw *me, void *dest, int space,
address_word addr, unsigned nr_bytes)
{
struct bfin_gpio *port = hw_data (me);
bu32 mmr_off;
bu16 *valuep;
/* Invalid access mode is higher priority than missing register. */
if (!dv_bfin_mmr_require_16 (me, addr, nr_bytes, false))
return 0;
mmr_off = addr - port->base;
valuep = (void *)((unsigned long)port + mmr_base() + mmr_off);
HW_TRACE_READ ();
switch (mmr_off)
{
case mmr_offset(data):
case mmr_offset(clear):
case mmr_offset(set):
case mmr_offset(toggle):
dv_store_2 (dest, port->data);
break;
case mmr_offset(maska):
case mmr_offset(maska_clear):
case mmr_offset(maska_set):
case mmr_offset(maska_toggle):
dv_store_2 (dest, port->maska);
break;
case mmr_offset(maskb):
case mmr_offset(maskb_clear):
case mmr_offset(maskb_set):
case mmr_offset(maskb_toggle):
dv_store_2 (dest, port->maskb);
break;
case mmr_offset(dir):
case mmr_offset(polar):
case mmr_offset(edge):
case mmr_offset(both):
case mmr_offset(inen):
dv_store_2 (dest, *valuep);
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
return 0;
}
return nr_bytes;
}
static const struct hw_port_descriptor bfin_gpio_ports[] =
{
{ "mask_a", 0, 0, output_port, },
{ "mask_b", 1, 0, output_port, },
{ "p0", 0, 0, bidirect_port, },
{ "p1", 1, 0, bidirect_port, },
{ "p2", 2, 0, bidirect_port, },
{ "p3", 3, 0, bidirect_port, },
{ "p4", 4, 0, bidirect_port, },
{ "p5", 5, 0, bidirect_port, },
{ "p6", 6, 0, bidirect_port, },
{ "p7", 7, 0, bidirect_port, },
{ "p8", 8, 0, bidirect_port, },
{ "p9", 9, 0, bidirect_port, },
{ "p10", 10, 0, bidirect_port, },
{ "p11", 11, 0, bidirect_port, },
{ "p12", 12, 0, bidirect_port, },
{ "p13", 13, 0, bidirect_port, },
{ "p14", 14, 0, bidirect_port, },
{ "p15", 15, 0, bidirect_port, },
{ NULL, 0, 0, 0, },
};
static void
bfin_gpio_port_event (struct hw *me, int my_port, struct hw *source,
int source_port, int level)
{
struct bfin_gpio *port = hw_data (me);
bool olvl, nlvl;
bu32 bit = (1 << my_port);
/* Normalize the level value. A simulated device can send any value
it likes to us, but in reality we only care about 0 and 1. This
lets us assume only those two values below. */
level = !!level;
HW_TRACE ((me, "pin %i set to %i", my_port, level));
/* Only screw with state if this pin is set as an input, and the
input is actually enabled. */
if ((port->dir & bit) || !(port->inen & bit))
{
HW_TRACE ((me, "ignoring level/int due to DIR=%i INEN=%i",
!!(port->dir & bit), !!(port->inen & bit)));
return;
}
/* Get the old pin state for calculating an interrupt. */
olvl = !!(port->data & bit);
/* Update the new pin state. */
port->data = (port->data & ~bit) | (level << my_port);
/* See if this state transition will generate an interrupt. */
nlvl = !!(port->data & bit);
if (port->edge & bit)
{
/* Pin is edge triggered. */
if (port->both & bit)
{
/* Both edges. */
if (olvl == nlvl)
{
HW_TRACE ((me, "ignoring int due to EDGE=%i BOTH=%i lvl=%i->%i",
!!(port->edge & bit), !!(port->both & bit),
olvl, nlvl));
return;
}
}
else
{
/* Just one edge. */
if (!(((port->polar & bit) && olvl > nlvl)
|| (!(port->polar & bit) && olvl < nlvl)))
{
HW_TRACE ((me, "ignoring int due to EDGE=%i POLAR=%i lvl=%i->%i",
!!(port->edge & bit), !!(port->polar & bit),
olvl, nlvl));
return;
}
}
/* Send the signal up, and then fall through to clear it. */
port->int_state |= bit;
bfin_gpio_forward_ints (me, port);
port->int_state &= ~bit;
}
else
{
/* Pin is level triggered. */
if (nlvl == !!(port->polar & bit))
{
HW_TRACE ((me, "ignoring int due to EDGE=%i POLAR=%i lvl=%i",
!!(port->edge & bit), !!(port->polar & bit), nlvl));
/* We still need to signal SIC to clear the int, so don't return. */
port->int_state &= ~bit;
}
else
port->int_state |= bit;
}
bfin_gpio_forward_ints (me, port);
}
static void
attach_bfin_gpio_regs (struct hw *me, struct bfin_gpio *port)
{
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, &reg))
hw_abort (me, "\"reg\" property must contain three addr/size entries");
hw_unit_address_to_attach_address (hw_parent (me),
&reg.address,
&attach_space, &attach_address, me);
hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
if (attach_size != BFIN_MMR_GPIO_SIZE)
hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_GPIO_SIZE);
hw_attach_address (hw_parent (me),
0, attach_space, attach_address, attach_size, me);
port->base = attach_address;
}
static void
bfin_gpio_finish (struct hw *me)
{
struct bfin_gpio *port;
port = HW_ZALLOC (me, struct bfin_gpio);
set_hw_data (me, port);
set_hw_io_read_buffer (me, bfin_gpio_io_read_buffer);
set_hw_io_write_buffer (me, bfin_gpio_io_write_buffer);
set_hw_ports (me, bfin_gpio_ports);
set_hw_port_event (me, bfin_gpio_port_event);
attach_bfin_gpio_regs (me, port);
}
const struct hw_descriptor dv_bfin_gpio_descriptor[] =
{
{"bfin_gpio", bfin_gpio_finish,},
{NULL, NULL},
};