1 /* 2 * Copyright (c) 2016, GlobalLogic 3 * Copyright (c) 2017, Linaro Limited 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 #include <drivers/scif.h> 29 #include <io.h> 30 #include <keep.h> 31 #include <util.h> 32 33 #define SCIF_SCFSR (0x10) 34 #define SCIF_SCFTDR (0x0C) 35 #define SCIF_SCFCR (0x18) 36 #define SCIF_SCFDR (0x1C) 37 38 #define SCFSR_TDFE BIT(5) 39 #define SCFSR_TEND BIT(6) 40 41 #define SCFDR_T_SHIFT 8 42 43 #define SCIF_TX_FIFO_SIZE 16 44 45 static vaddr_t chip_to_base(struct serial_chip *chip) 46 { 47 struct scif_uart_data *pd = 48 container_of(chip, struct scif_uart_data, chip); 49 50 return io_pa_or_va(&pd->base); 51 } 52 53 static void scif_uart_flush(struct serial_chip *chip) 54 { 55 vaddr_t base = chip_to_base(chip); 56 57 while (!(read16(base + SCIF_SCFSR) & SCFSR_TEND)) 58 ; 59 } 60 61 static void scif_uart_putc(struct serial_chip *chip, int ch) 62 { 63 vaddr_t base = chip_to_base(chip); 64 65 /* Wait until there is space in the FIFO */ 66 while ((read16(base + SCIF_SCFDR) >> SCFDR_T_SHIFT) >= 67 SCIF_TX_FIFO_SIZE) 68 ; 69 write8(ch, base + SCIF_SCFTDR); 70 write16(read16(base + SCIF_SCFSR) & ~(SCFSR_TEND | SCFSR_TDFE), 71 base + SCIF_SCFSR); 72 } 73 74 static const struct serial_ops scif_uart_ops = { 75 .flush = scif_uart_flush, 76 .putc = scif_uart_putc, 77 }; 78 KEEP_PAGER(scif_uart_ops); 79 80 void scif_uart_init(struct scif_uart_data *pd, vaddr_t base) 81 { 82 pd->base.pa = base; 83 pd->chip.ops = &scif_uart_ops; 84 85 /* Bootloader should initialize device for us */ 86 scif_uart_flush(&pd->chip); 87 } 88