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/* Blackfin Serial Peripheral Interface (SPI) model
Copyright (C) 2010-2011 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_spi.h"
/* XXX: This is merely a stub. */
struct bfin_spi
{
/* 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(ctl);
bu16 BFIN_MMR_16(flg);
bu16 BFIN_MMR_16(stat);
bu16 BFIN_MMR_16(tdbr);
bu16 BFIN_MMR_16(rdbr);
bu16 BFIN_MMR_16(baud);
bu16 BFIN_MMR_16(shadow);
};
#define mmr_base() offsetof(struct bfin_spi, ctl)
#define mmr_offset(mmr) (offsetof(struct bfin_spi, mmr) - mmr_base())
static const char * const mmr_names[] =
{
"SPI_CTL", "SPI_FLG", "SPI_STAT", "SPI_TDBR",
"SPI_RDBR", "SPI_BAUD", "SPI_SHADOW",
};
#define mmr_name(off) mmr_names[(off) / 4]
static bool
bfin_spi_enabled (struct bfin_spi *spi)
{
return (spi->ctl & SPE);
}
static bu16
bfin_spi_timod (struct bfin_spi *spi)
{
return (spi->ctl & TIMOD);
}
static unsigned
bfin_spi_io_write_buffer (struct hw *me, const void *source, int space,
address_word addr, unsigned nr_bytes)
{
struct bfin_spi *spi = hw_data (me);
bu32 mmr_off;
bu32 value;
bu16 *valuep;
value = dv_load_2 (source);
mmr_off = addr - spi->base;
valuep = (void *)((unsigned long)spi + mmr_base() + mmr_off);
HW_TRACE_WRITE ();
dv_bfin_mmr_require_16 (me, addr, nr_bytes, true);
switch (mmr_off)
{
case mmr_offset(stat):
dv_w1c_2 (valuep, value, SPIF | TXS | RXS);
break;
case mmr_offset(tdbr):
*valuep = value;
if (bfin_spi_enabled (spi) && bfin_spi_timod (spi) == TDBR_CORE)
{
spi->stat |= RXS;
spi->stat &= ~TXS;
}
break;
case mmr_offset(rdbr):
case mmr_offset(ctl):
case mmr_offset(flg):
case mmr_offset(baud):
case mmr_offset(shadow):
*valuep = value;
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
break;
}
return nr_bytes;
}
static unsigned
bfin_spi_io_read_buffer (struct hw *me, void *dest, int space,
address_word addr, unsigned nr_bytes)
{
struct bfin_spi *spi = hw_data (me);
bu32 mmr_off;
bu16 *valuep;
mmr_off = addr - spi->base;
valuep = (void *)((unsigned long)spi + mmr_base() + mmr_off);
HW_TRACE_READ ();
dv_bfin_mmr_require_16 (me, addr, nr_bytes, false);
switch (mmr_off)
{
case mmr_offset(rdbr):
dv_store_2 (dest, *valuep);
if (bfin_spi_enabled (spi) && bfin_spi_timod (spi) == RDBR_CORE)
spi->stat &= ~(RXS | TXS);
break;
case mmr_offset(ctl):
case mmr_offset(stat):
case mmr_offset(flg):
case mmr_offset(tdbr):
case mmr_offset(baud):
case mmr_offset(shadow):
dv_store_2 (dest, *valuep);
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
break;
}
return nr_bytes;
}
static unsigned
bfin_spi_dma_read_buffer (struct hw *me, void *dest, int space,
unsigned_word addr, unsigned nr_bytes)
{
HW_TRACE_DMA_READ ();
return 0;
}
static unsigned
bfin_spi_dma_write_buffer (struct hw *me, const void *source,
int space, unsigned_word addr,
unsigned nr_bytes,
int violate_read_only_section)
{
HW_TRACE_DMA_WRITE ();
return 0;
}
static const struct hw_port_descriptor bfin_spi_ports[] =
{
{ "stat", 0, 0, output_port, },
{ NULL, 0, 0, 0, },
};
static void
attach_bfin_spi_regs (struct hw *me, struct bfin_spi *spi)
{
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_SPI_SIZE)
hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_SPI_SIZE);
hw_attach_address (hw_parent (me),
0, attach_space, attach_address, attach_size, me);
spi->base = attach_address;
}
static void
bfin_spi_finish (struct hw *me)
{
struct bfin_spi *spi;
spi = HW_ZALLOC (me, struct bfin_spi);
set_hw_data (me, spi);
set_hw_io_read_buffer (me, bfin_spi_io_read_buffer);
set_hw_io_write_buffer (me, bfin_spi_io_write_buffer);
set_hw_dma_read_buffer (me, bfin_spi_dma_read_buffer);
set_hw_dma_write_buffer (me, bfin_spi_dma_write_buffer);
set_hw_ports (me, bfin_spi_ports);
attach_bfin_spi_regs (me, spi);
/* Initialize the SPI. */
spi->ctl = 0x0400;
spi->flg = 0xFF00;
spi->stat = 0x0001;
}
const struct hw_descriptor dv_bfin_spi_descriptor[] = {
{"bfin_spi", bfin_spi_finish,},
{NULL, NULL},
};
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