1 /* 2 * QEMU lowRISC Ibex UART device 3 * 4 * Copyright (c) 2020 Western Digital 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #ifndef HW_IBEX_UART_H 26 #define HW_IBEX_UART_H 27 28 #include "hw/sysbus.h" 29 #include "chardev/char-fe.h" 30 #include "qemu/timer.h" 31 #include "qom/object.h" 32 33 #define IBEX_UART_TX_FIFO_SIZE 16 34 #define IBEX_UART_CLOCK 50000000 /* 50MHz clock */ 35 36 #define TYPE_IBEX_UART "ibex-uart" 37 OBJECT_DECLARE_SIMPLE_TYPE(IbexUartState, IBEX_UART) 38 39 struct IbexUartState { 40 /* <private> */ 41 SysBusDevice parent_obj; 42 43 /* <public> */ 44 MemoryRegion mmio; 45 46 uint8_t tx_fifo[IBEX_UART_TX_FIFO_SIZE]; 47 uint32_t tx_level; 48 49 uint32_t rx_level; 50 51 QEMUTimer *fifo_trigger_handle; 52 uint64_t char_tx_time; 53 54 uint32_t uart_intr_state; 55 uint32_t uart_intr_enable; 56 uint32_t uart_ctrl; 57 uint32_t uart_status; 58 uint32_t uart_rdata; 59 uint32_t uart_fifo_ctrl; 60 uint32_t uart_fifo_status; 61 uint32_t uart_ovrd; 62 uint32_t uart_val; 63 uint32_t uart_timeout_ctrl; 64 65 Clock *f_clk; 66 67 CharBackend chr; 68 qemu_irq tx_watermark; 69 qemu_irq rx_watermark; 70 qemu_irq tx_empty; 71 qemu_irq rx_overflow; 72 }; 73 #endif /* HW_IBEX_UART_H */ 74