1 /* 2 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef LS_16550_H 8 #define LS_16550_H 9 10 #include <drivers/console.h> 11 12 /* UART16550 Registers */ 13 #define UARTTX 0x0 14 #define UARTRX 0x0 15 #define UARTDLL 0x0 16 #define UARTIER 0x1 17 #define UARTDLLM 0x1 18 #define UARTFCR 0x2 19 #define UARTLCR 0x3 20 #define UARTLSR 0x5 21 #define UARTMCR 0x4 22 23 /* FIFO Control Register bits */ 24 #define UARTFCR_FIFOMD_16450 (0 << 6) 25 #define UARTFCR_FIFOMD_16550 (1 << 6) 26 #define UARTFCR_RXTRIG_1 (0 << 6) 27 #define UARTFCR_RXTRIG_4 (1 << 6) 28 #define UARTFCR_RXTRIG_8 (2 << 6) 29 #define UARTFCR_RXTRIG_16 (3 << 6) 30 #define UARTFCR_TXTRIG_1 (0 << 4) 31 #define UARTFCR_TXTRIG_4 (1 << 4) 32 #define UARTFCR_TXTRIG_8 (2 << 4) 33 #define UARTFCR_TXTRIG_16 (3 << 4) 34 #define UARTFCR_DMAEN (1 << 3) /* Enable DMA mode */ 35 #define UARTFCR_TXCLR (1 << 2) /* Clear contents of Tx FIFO */ 36 #define UARTFCR_RXCLR (1 << 1) /* Clear contents of Rx FIFO */ 37 #define UARTFCR_FIFOEN (1 << 0) /* Enable the Tx/Rx FIFO */ 38 #define UARTFCR_64FIFO (1 << 5) 39 40 /* Line Control Register bits */ 41 #define UARTLCR_DLAB (1 << 7) /* Divisor Latch Access */ 42 #define UARTLCR_SETB (1 << 6) /* Set BREAK Condition */ 43 #define UARTLCR_SETP (1 << 5) /* Set Parity to LCR[4] */ 44 #define UARTLCR_EVEN (1 << 4) /* Even Parity Format */ 45 #define UARTLCR_PAR (1 << 3) /* Parity */ 46 #define UARTLCR_STOP (1 << 2) /* Stop Bit */ 47 #define UARTLCR_WORDSZ_5 0 /* Word Length of 5 */ 48 #define UARTLCR_WORDSZ_6 1 /* Word Length of 6 */ 49 #define UARTLCR_WORDSZ_7 2 /* Word Length of 7 */ 50 #define UARTLCR_WORDSZ_8 3 /* Word Length of 8 */ 51 52 /* Line Status Register bits */ 53 #define UARTLSR_RXFIFOEMT (1 << 9) /* Rx Fifo Empty */ 54 #define UARTLSR_TXFIFOFULL (1 << 8) /* Tx Fifo Full */ 55 #define UARTLSR_RXFIFOERR (1 << 7) /* Rx Fifo Error */ 56 #define UARTLSR_TEMT (1 << 6) /* Tx Shift Register Empty */ 57 #define UARTLSR_THRE (1 << 5) /* Tx Holding Register Empty */ 58 #define UARTLSR_BRK (1 << 4) /* Break Condition Detected */ 59 #define UARTLSR_FERR (1 << 3) /* Framing Error */ 60 #define UARTLSR_PERR (1 << 3) /* Parity Error */ 61 #define UARTLSR_OVRF (1 << 2) /* Rx Overrun Error */ 62 #define UARTLSR_RDR (1 << 2) /* Rx Data Ready */ 63 64 #define CONSOLE_T_16550_BASE CONSOLE_T_DRVDATA 65 66 #ifndef __ASSEMBLER__ 67 68 #include <stdint.h> 69 70 typedef struct { 71 console_t console; 72 uintptr_t base; 73 } console_ls_16550_t; 74 75 /* 76 * Initialize a new 16550 console instance and register it with the console 77 * framework. The |console| pointer must point to storage that will be valid 78 * for the lifetime of the console, such as a global or static local variable. 79 * Its contents will be reinitialized from scratch. 80 */ 81 int console_ls_16550_register(uintptr_t baseaddr, uint32_t clock, uint32_t baud, 82 console_ls_16550_t *console); 83 84 #endif /*__ASSEMBLER__*/ 85 86 #endif /* LS_16550_H */ 87