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/* Blackfin Universal Asynchronous Receiver/Transmitter (UART) model.
For "new style" UARTs on BF50x/BF54x parts.
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_uart2.h"
/* XXX: Should we bother emulating the TX/RX FIFOs ? */
/* Internal state needs to be the same as bfin_uart. */
struct bfin_uart
{
/* 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;
/* Accessed indirectly by ier_{set,clear}. */
bu16 ier;
/* Order after here is important -- matches hardware MMR layout. */
bu16 BFIN_MMR_16(dll);
bu16 BFIN_MMR_16(dlh);
bu16 BFIN_MMR_16(gctl);
bu16 BFIN_MMR_16(lcr);
bu16 BFIN_MMR_16(mcr);
bu16 BFIN_MMR_16(lsr);
bu16 BFIN_MMR_16(msr);
bu16 BFIN_MMR_16(scr);
bu16 BFIN_MMR_16(ier_set);
bu16 BFIN_MMR_16(ier_clear);
bu16 BFIN_MMR_16(thr);
bu16 BFIN_MMR_16(rbr);
};
#define mmr_base() offsetof(struct bfin_uart, dll)
#define mmr_offset(mmr) (offsetof(struct bfin_uart, mmr) - mmr_base())
static const char * const mmr_names[] =
{
"UART_DLL", "UART_DLH", "UART_GCTL", "UART_LCR", "UART_MCR", "UART_LSR",
"UART_MSR", "UART_SCR", "UART_IER_SET", "UART_IER_CLEAR", "UART_THR",
"UART_RBR",
};
#define mmr_name(off) mmr_names[(off) / 4]
static unsigned
bfin_uart_io_write_buffer (struct hw *me, const void *source,
int space, address_word addr, unsigned nr_bytes)
{
struct bfin_uart *uart = hw_data (me);
bu32 mmr_off;
bu32 value;
bu16 *valuep;
/* 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 - uart->base;
valuep = (void *)((unsigned long)uart + mmr_base() + mmr_off);
HW_TRACE_WRITE ();
/* XXX: All MMRs are "8bit" ... what happens to high 8bits ? */
switch (mmr_off)
{
case mmr_offset(thr):
uart->thr = bfin_uart_write_byte (me, value, uart->mcr);
if (uart->ier & ETBEI)
hw_port_event (me, DV_PORT_TX, 1);
break;
case mmr_offset(ier_set):
uart->ier |= value;
break;
case mmr_offset(ier_clear):
dv_w1c_2 (&uart->ier, value, -1);
break;
case mmr_offset(lsr):
dv_w1c_2 (valuep, value, TFI | BI | FE | PE | OE);
break;
case mmr_offset(rbr):
/* XXX: Writes are ignored ? */
break;
case mmr_offset(msr):
dv_w1c_2 (valuep, value, SCTS);
break;
case mmr_offset(dll):
case mmr_offset(dlh):
case mmr_offset(gctl):
case mmr_offset(lcr):
case mmr_offset(mcr):
case mmr_offset(scr):
*valuep = value;
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
return 0;
}
return nr_bytes;
}
static unsigned
bfin_uart_io_read_buffer (struct hw *me, void *dest,
int space, address_word addr, unsigned nr_bytes)
{
struct bfin_uart *uart = 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 - uart->base;
valuep = (void *)((unsigned long)uart + mmr_base() + mmr_off);
HW_TRACE_READ ();
switch (mmr_off)
{
case mmr_offset(rbr):
uart->rbr = bfin_uart_get_next_byte (me, uart->rbr, uart->mcr, NULL);
dv_store_2 (dest, uart->rbr);
break;
case mmr_offset(ier_set):
case mmr_offset(ier_clear):
dv_store_2 (dest, uart->ier);
bfin_uart_reschedule (me);
break;
case mmr_offset(lsr):
uart->lsr &= ~(DR | THRE | TEMT);
uart->lsr |= bfin_uart_get_status (me);
case mmr_offset(thr):
case mmr_offset(msr):
case mmr_offset(dll):
case mmr_offset(dlh):
case mmr_offset(gctl):
case mmr_offset(lcr):
case mmr_offset(mcr):
case mmr_offset(scr):
dv_store_2 (dest, *valuep);
break;
default:
dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
return 0;
}
return nr_bytes;
}
static unsigned
bfin_uart_dma_read_buffer (struct hw *me, void *dest, int space,
unsigned_word addr, unsigned nr_bytes)
{
HW_TRACE_DMA_READ ();
return bfin_uart_read_buffer (me, dest, nr_bytes);
}
static unsigned
bfin_uart_dma_write_buffer (struct hw *me, const void *source,
int space, unsigned_word addr,
unsigned nr_bytes,
int violate_read_only_section)
{
struct bfin_uart *uart = hw_data (me);
unsigned ret;
HW_TRACE_DMA_WRITE ();
ret = bfin_uart_write_buffer (me, source, nr_bytes);
if (ret == nr_bytes && (uart->ier & ETBEI))
hw_port_event (me, DV_PORT_TX, 1);
return ret;
}
static const struct hw_port_descriptor bfin_uart_ports[] =
{
{ "tx", DV_PORT_TX, 0, output_port, },
{ "rx", DV_PORT_RX, 0, output_port, },
{ "stat", DV_PORT_STAT, 0, output_port, },
{ NULL, 0, 0, 0, },
};
static void
attach_bfin_uart_regs (struct hw *me, struct bfin_uart *uart)
{
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_UART2_SIZE)
hw_abort (me, "\"reg\" size must be %#x", BFIN_MMR_UART2_SIZE);
hw_attach_address (hw_parent (me),
0, attach_space, attach_address, attach_size, me);
uart->base = attach_address;
}
static void
bfin_uart_finish (struct hw *me)
{
struct bfin_uart *uart;
uart = HW_ZALLOC (me, struct bfin_uart);
set_hw_data (me, uart);
set_hw_io_read_buffer (me, bfin_uart_io_read_buffer);
set_hw_io_write_buffer (me, bfin_uart_io_write_buffer);
set_hw_dma_read_buffer (me, bfin_uart_dma_read_buffer);
set_hw_dma_write_buffer (me, bfin_uart_dma_write_buffer);
set_hw_ports (me, bfin_uart_ports);
attach_bfin_uart_regs (me, uart);
/* Initialize the UART. */
uart->dll = 0x0001;
uart->lsr = 0x0060;
}
const struct hw_descriptor dv_bfin_uart2_descriptor[] =
{
{"bfin_uart2", bfin_uart_finish,},
{NULL, NULL},
};
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