| /* |
| * QEMU lowRISC Ibex UART device |
| * |
| * Copyright (c) 2020 Western Digital |
| * |
| * 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. |
| */ |
| |
| #ifndef HW_IBEX_UART_H |
| #define HW_IBEX_UART_H |
| |
| #include "hw/sysbus.h" |
| #include "hw/registerfields.h" |
| #include "chardev/char-fe.h" |
| #include "qemu/timer.h" |
| |
| REG32(INTR_STATE, 0x00) |
| FIELD(INTR_STATE, TX_WATERMARK, 0, 1) |
| FIELD(INTR_STATE, RX_WATERMARK, 1, 1) |
| FIELD(INTR_STATE, TX_EMPTY, 2, 1) |
| FIELD(INTR_STATE, RX_OVERFLOW, 3, 1) |
| REG32(INTR_ENABLE, 0x04) |
| REG32(INTR_TEST, 0x08) |
| REG32(CTRL, 0x0C) |
| FIELD(CTRL, TX_ENABLE, 0, 1) |
| FIELD(CTRL, RX_ENABLE, 1, 1) |
| FIELD(CTRL, NF, 2, 1) |
| FIELD(CTRL, SLPBK, 4, 1) |
| FIELD(CTRL, LLPBK, 5, 1) |
| FIELD(CTRL, PARITY_EN, 6, 1) |
| FIELD(CTRL, PARITY_ODD, 7, 1) |
| FIELD(CTRL, RXBLVL, 8, 2) |
| FIELD(CTRL, NCO, 16, 16) |
| REG32(STATUS, 0x10) |
| FIELD(STATUS, TXFULL, 0, 1) |
| FIELD(STATUS, RXFULL, 1, 1) |
| FIELD(STATUS, TXEMPTY, 2, 1) |
| FIELD(STATUS, RXIDLE, 4, 1) |
| FIELD(STATUS, RXEMPTY, 5, 1) |
| REG32(RDATA, 0x14) |
| REG32(WDATA, 0x18) |
| REG32(FIFO_CTRL, 0x1c) |
| FIELD(FIFO_CTRL, RXRST, 0, 1) |
| FIELD(FIFO_CTRL, TXRST, 1, 1) |
| FIELD(FIFO_CTRL, RXILVL, 2, 3) |
| FIELD(FIFO_CTRL, TXILVL, 5, 2) |
| REG32(FIFO_STATUS, 0x20) |
| REG32(OVRD, 0x24) |
| REG32(VAL, 0x28) |
| REG32(TIMEOUT_CTRL, 0x2c) |
| |
| #define IBEX_UART_TX_FIFO_SIZE 16 |
| #define IBEX_UART_CLOCK 50000000 /* 50MHz clock */ |
| |
| #define TYPE_IBEX_UART "ibex-uart" |
| #define IBEX_UART(obj) \ |
| OBJECT_CHECK(IbexUartState, (obj), TYPE_IBEX_UART) |
| |
| typedef struct { |
| /* <private> */ |
| SysBusDevice parent_obj; |
| |
| /* <public> */ |
| MemoryRegion mmio; |
| |
| uint8_t tx_fifo[IBEX_UART_TX_FIFO_SIZE]; |
| uint32_t tx_level; |
| |
| QEMUTimer *fifo_trigger_handle; |
| uint64_t char_tx_time; |
| |
| uint32_t uart_intr_state; |
| uint32_t uart_intr_enable; |
| uint32_t uart_ctrl; |
| uint32_t uart_status; |
| uint32_t uart_rdata; |
| uint32_t uart_fifo_ctrl; |
| uint32_t uart_fifo_status; |
| uint32_t uart_ovrd; |
| uint32_t uart_val; |
| uint32_t uart_timeout_ctrl; |
| |
| Clock *f_clk; |
| |
| CharBackend chr; |
| qemu_irq tx_watermark; |
| qemu_irq rx_watermark; |
| qemu_irq tx_empty; |
| qemu_irq rx_overflow; |
| } IbexUartState; |
| #endif /* HW_IBEX_UART_H */ |
