1 /* 2 * SHAKTI UART 3 * 4 * Copyright (c) 2021 Vijai Kumar K <vijai@behindbytes.com> 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_SHAKTI_UART_H 26 #define HW_SHAKTI_UART_H 27 28 #include "hw/sysbus.h" 29 #include "chardev/char-fe.h" 30 31 #define SHAKTI_UART_BAUD 0x00 32 #define SHAKTI_UART_TX 0x04 33 #define SHAKTI_UART_RX 0x08 34 #define SHAKTI_UART_STATUS 0x0C 35 #define SHAKTI_UART_DELAY 0x10 36 #define SHAKTI_UART_CONTROL 0x14 37 #define SHAKTI_UART_INT_EN 0x18 38 #define SHAKTI_UART_IQ_CYCLES 0x1C 39 #define SHAKTI_UART_RX_THRES 0x20 40 41 #define SHAKTI_UART_STATUS_TX_EMPTY (1 << 0) 42 #define SHAKTI_UART_STATUS_TX_FULL (1 << 1) 43 #define SHAKTI_UART_STATUS_RX_NOT_EMPTY (1 << 2) 44 #define SHAKTI_UART_STATUS_RX_FULL (1 << 3) 45 /* 9600 8N1 is the default setting */ 46 /* Reg value = (50000000 Hz)/(16 * 9600)*/ 47 #define SHAKTI_UART_BAUD_DEFAULT 0x0145 48 #define SHAKTI_UART_CONTROL_DEFAULT 0x0100 49 50 #define TYPE_SHAKTI_UART "shakti-uart" 51 #define SHAKTI_UART(obj) \ 52 OBJECT_CHECK(ShaktiUartState, (obj), TYPE_SHAKTI_UART) 53 54 typedef struct { 55 /* <private> */ 56 SysBusDevice parent_obj; 57 58 /* <public> */ 59 MemoryRegion mmio; 60 61 uint32_t uart_baud; 62 uint32_t uart_tx; 63 uint32_t uart_rx; 64 uint32_t uart_status; 65 uint32_t uart_delay; 66 uint32_t uart_control; 67 uint32_t uart_interrupt; 68 uint32_t uart_iq_cycles; 69 uint32_t uart_rx_threshold; 70 71 CharBackend chr; 72 } ShaktiUartState; 73 74 #endif /* HW_SHAKTI_UART_H */ 75