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/*
* SiFive UART interface
*
* Copyright (c) 2016 Stefan O'Rear
* Copyright (c) 2017 SiFive, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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/>.
*/
#ifndef HW_SIFIVE_UART_H
#define HW_SIFIVE_UART_H
#include "chardev/char-fe.h"
#include "hw/sysbus.h"
enum {
SIFIVE_UART_TXFIFO = 0,
SIFIVE_UART_RXFIFO = 4,
SIFIVE_UART_TXCTRL = 8,
SIFIVE_UART_TXMARK = 10,
SIFIVE_UART_RXCTRL = 12,
SIFIVE_UART_RXMARK = 14,
SIFIVE_UART_IE = 16,
SIFIVE_UART_IP = 20,
SIFIVE_UART_DIV = 24,
SIFIVE_UART_MAX = 32
};
enum {
SIFIVE_UART_IE_TXWM = 1, /* Transmit watermark interrupt enable */
SIFIVE_UART_IE_RXWM = 2 /* Receive watermark interrupt enable */
};
enum {
SIFIVE_UART_IP_TXWM = 1, /* Transmit watermark interrupt pending */
SIFIVE_UART_IP_RXWM = 2 /* Receive watermark interrupt pending */
};
#define SIFIVE_UART_GET_TXCNT(txctrl) ((txctrl >> 16) & 0x7)
#define SIFIVE_UART_GET_RXCNT(rxctrl) ((rxctrl >> 16) & 0x7)
#define TYPE_SIFIVE_UART "riscv.sifive.uart"
#define SIFIVE_UART(obj) \
OBJECT_CHECK(SiFiveUARTState, (obj), TYPE_SIFIVE_UART)
typedef struct SiFiveUARTState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
qemu_irq irq;
MemoryRegion mmio;
CharBackend chr;
uint8_t rx_fifo[8];
unsigned int rx_fifo_len;
uint32_t ie;
uint32_t ip;
uint32_t txctrl;
uint32_t rxctrl;
uint32_t div;
} SiFiveUARTState;
SiFiveUARTState *sifive_uart_create(MemoryRegion *address_space, hwaddr base,
Chardev *chr, qemu_irq irq);
#endif
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