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Diffstat (limited to 'include/hw/char/sifive_uart.h')
-rw-r--r-- | include/hw/char/sifive_uart.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/include/hw/char/sifive_uart.h b/include/hw/char/sifive_uart.h new file mode 100644 index 0000000000..65668825a3 --- /dev/null +++ b/include/hw/char/sifive_uart.h @@ -0,0 +1,77 @@ +/* + * 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 |