| // SPDX-License-Identifier: BSD-2-Clause |
| /* |
| * Copyright (c) 2016, Spreadtrum Communications Inc. |
| * Copyright (c) 2017, Linaro Limited |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| #include <drivers/sprd_uart.h> |
| #include <io.h> |
| #include <keep.h> |
| #include <util.h> |
| |
| /* Register definitions */ |
| #define UART_TXD 0x0000 |
| #define UART_RXD 0x0004 |
| #define UART_STS1 0x000C /* data number in TX and RX fifo */ |
| |
| /* Register Bit Fields*/ |
| #define STS1_RXF_CNT_MASK 0x00ff /* Rx FIFO data counter mask */ |
| #define STS1_TXF_CNT_MASK 0xff00 /* Tx FIFO data counter mask */ |
| |
| static vaddr_t chip_to_base(struct serial_chip *chip) |
| { |
| struct sprd_uart_data *pd = |
| container_of(chip, struct sprd_uart_data, chip); |
| |
| return io_pa_or_va(&pd->base); |
| } |
| |
| static void sprd_uart_flush(struct serial_chip *chip) |
| { |
| vaddr_t base = chip_to_base(chip); |
| |
| while (io_read32(base + UART_STS1) & STS1_TXF_CNT_MASK) |
| ; |
| } |
| |
| static bool sprd_uart_have_rx_data(struct serial_chip *chip) |
| { |
| vaddr_t base = chip_to_base(chip); |
| |
| return !!(io_read32(base + UART_STS1) & STS1_RXF_CNT_MASK); |
| } |
| |
| static void sprd_uart_putc(struct serial_chip *chip, int ch) |
| { |
| vaddr_t base = chip_to_base(chip); |
| |
| sprd_uart_flush(chip); |
| io_write32(base + UART_TXD, ch); |
| } |
| |
| static int sprd_uart_getchar(struct serial_chip *chip) |
| { |
| vaddr_t base = chip_to_base(chip); |
| |
| while (!sprd_uart_have_rx_data(chip)) |
| ; |
| |
| return io_read32(base + UART_RXD) & 0xff; |
| } |
| |
| static const struct serial_ops sprd_uart_ops = { |
| .flush = sprd_uart_flush, |
| .getchar = sprd_uart_getchar, |
| .have_rx_data = sprd_uart_have_rx_data, |
| .putc = sprd_uart_putc, |
| }; |
| KEEP_PAGER(sprd_uart_ops); |
| |
| void sprd_uart_init(struct sprd_uart_data *pd, paddr_t base) |
| { |
| pd->base.pa = base; |
| pd->chip.ops = &sprd_uart_ops; |
| } |