qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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ibex_uart.h (2234B)

      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 "hw/registerfields.h"
     30 #include "chardev/char-fe.h"
     31 #include "qemu/timer.h"
     32 #include "qom/object.h"
     33 
     34 #define IBEX_UART_TX_FIFO_SIZE 16
     35 #define IBEX_UART_CLOCK 50000000 /* 50MHz clock */
     36 
     37 #define TYPE_IBEX_UART "ibex-uart"
     38 OBJECT_DECLARE_SIMPLE_TYPE(IbexUartState, IBEX_UART)
     39 
     40 struct IbexUartState {
     41     /* <private> */
     42     SysBusDevice parent_obj;
     43 
     44     /* <public> */
     45     MemoryRegion mmio;
     46 
     47     uint8_t tx_fifo[IBEX_UART_TX_FIFO_SIZE];
     48     uint32_t tx_level;
     49 
     50     uint32_t rx_level;
     51 
     52     QEMUTimer *fifo_trigger_handle;
     53     uint64_t char_tx_time;
     54 
     55     uint32_t uart_intr_state;
     56     uint32_t uart_intr_enable;
     57     uint32_t uart_ctrl;
     58     uint32_t uart_status;
     59     uint32_t uart_rdata;
     60     uint32_t uart_fifo_ctrl;
     61     uint32_t uart_fifo_status;
     62     uint32_t uart_ovrd;
     63     uint32_t uart_val;
     64     uint32_t uart_timeout_ctrl;
     65 
     66     Clock *f_clk;
     67 
     68     CharBackend chr;
     69     qemu_irq tx_watermark;
     70     qemu_irq rx_watermark;
     71     qemu_irq tx_empty;
     72     qemu_irq rx_overflow;
     73 };
     74 #endif /* HW_IBEX_UART_H */