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/*
* SHAKTI UART
*
* Copyright (c) 2021 Vijai Kumar K <vijai@behindbytes.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "hw/char/shakti_uart.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "qemu/log.h"
static uint64_t shakti_uart_read(void *opaque, hwaddr addr, unsigned size)
{
ShaktiUartState *s = opaque;
switch (addr) {
case SHAKTI_UART_BAUD:
return s->uart_baud;
case SHAKTI_UART_RX:
qemu_chr_fe_accept_input(&s->chr);
s->uart_status &= ~SHAKTI_UART_STATUS_RX_NOT_EMPTY;
return s->uart_rx;
case SHAKTI_UART_STATUS:
return s->uart_status;
case SHAKTI_UART_DELAY:
return s->uart_delay;
case SHAKTI_UART_CONTROL:
return s->uart_control;
case SHAKTI_UART_INT_EN:
return s->uart_interrupt;
case SHAKTI_UART_IQ_CYCLES:
return s->uart_iq_cycles;
case SHAKTI_UART_RX_THRES:
return s->uart_rx_threshold;
default:
/* Also handles TX REG which is write only */
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
}
return 0;
}
static void shakti_uart_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
ShaktiUartState *s = opaque;
uint32_t value = data;
uint8_t ch;
switch (addr) {
case SHAKTI_UART_BAUD:
s->uart_baud = value;
break;
case SHAKTI_UART_TX:
ch = value;
qemu_chr_fe_write_all(&s->chr, &ch, 1);
s->uart_status &= ~SHAKTI_UART_STATUS_TX_FULL;
break;
case SHAKTI_UART_STATUS:
s->uart_status = value;
break;
case SHAKTI_UART_DELAY:
s->uart_delay = value;
break;
case SHAKTI_UART_CONTROL:
s->uart_control = value;
break;
case SHAKTI_UART_INT_EN:
s->uart_interrupt = value;
break;
case SHAKTI_UART_IQ_CYCLES:
s->uart_iq_cycles = value;
break;
case SHAKTI_UART_RX_THRES:
s->uart_rx_threshold = value;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
"%s: Bad offset 0x%"HWADDR_PRIx"\n", __func__, addr);
}
}
static const MemoryRegionOps shakti_uart_ops = {
.read = shakti_uart_read,
.write = shakti_uart_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {.min_access_size = 1, .max_access_size = 4},
.valid = {.min_access_size = 1, .max_access_size = 4},
};
static void shakti_uart_reset(DeviceState *dev)
{
ShaktiUartState *s = SHAKTI_UART(dev);
s->uart_baud = SHAKTI_UART_BAUD_DEFAULT;
s->uart_tx = 0x0;
s->uart_rx = 0x0;
s->uart_status = 0x0000;
s->uart_delay = 0x0000;
s->uart_control = SHAKTI_UART_CONTROL_DEFAULT;
s->uart_interrupt = 0x0000;
s->uart_iq_cycles = 0x00;
s->uart_rx_threshold = 0x00;
}
static int shakti_uart_can_receive(void *opaque)
{
ShaktiUartState *s = opaque;
return !(s->uart_status & SHAKTI_UART_STATUS_RX_NOT_EMPTY);
}
static void shakti_uart_receive(void *opaque, const uint8_t *buf, int size)
{
ShaktiUartState *s = opaque;
s->uart_rx = *buf;
s->uart_status |= SHAKTI_UART_STATUS_RX_NOT_EMPTY;
}
static void shakti_uart_realize(DeviceState *dev, Error **errp)
{
ShaktiUartState *sus = SHAKTI_UART(dev);
qemu_chr_fe_set_handlers(&sus->chr, shakti_uart_can_receive,
shakti_uart_receive, NULL, NULL, sus, NULL, true);
}
static void shakti_uart_instance_init(Object *obj)
{
ShaktiUartState *sus = SHAKTI_UART(obj);
memory_region_init_io(&sus->mmio,
obj,
&shakti_uart_ops,
sus,
TYPE_SHAKTI_UART,
0x1000);
sysbus_init_mmio(SYS_BUS_DEVICE(obj), &sus->mmio);
}
static const Property shakti_uart_properties[] = {
DEFINE_PROP_CHR("chardev", ShaktiUartState, chr),
};
static void shakti_uart_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_legacy_reset(dc, shakti_uart_reset);
dc->realize = shakti_uart_realize;
device_class_set_props(dc, shakti_uart_properties);
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}
static const TypeInfo shakti_uart_info = {
.name = TYPE_SHAKTI_UART,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(ShaktiUartState),
.class_init = shakti_uart_class_init,
.instance_init = shakti_uart_instance_init,
};
static void shakti_uart_register_types(void)
{
type_register_static(&shakti_uart_info);
}
type_init(shakti_uart_register_types)
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