1 /* 2 * Copyright (c) 2016, GlobalLogic 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 #include <compiler.h> 28 #include <io.h> 29 #include <util.h> 30 #include <drivers/scif.h> 31 32 #define SCIF_SCFSR (0x10) 33 #define SCIF_SCFTDR (0x0C) 34 #define SCIF_SCFCR (0x18) 35 #define SCIF_SCFDR (0x1C) 36 37 #define SCFSR_TDFE BIT(5) 38 #define SCFSR_TEND BIT(6) 39 40 #define SCFDR_T_SHIFT 8 41 42 #define SCIF_TX_FIFO_SIZE 16 43 44 void scif_uart_flush(vaddr_t base) 45 { 46 while (!(read16(base + SCIF_SCFSR) & SCFSR_TEND)) 47 ; 48 } 49 50 void scif_uart_init(vaddr_t base) 51 { 52 /* Bootloader should initialize device for us */ 53 scif_uart_flush(base); 54 } 55 56 void scif_uart_putc(int ch, vaddr_t base) 57 { 58 /* Wait until there is space in the FIFO */ 59 while ((read16(base + SCIF_SCFDR) >> SCFDR_T_SHIFT) >= 60 SCIF_TX_FIFO_SIZE) 61 ; 62 write8(ch, base + SCIF_SCFTDR); 63 write16(read16(base + SCIF_SCFSR) & ~(SCFSR_TEND | SCFSR_TDFE), 64 base + SCIF_SCFSR); 65 } 66