/* * Copyright 2013 Google Inc. * * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <libpayload.h> #include <stdint.h> struct s5p_uart { uint32_t ulcon; // line control uint32_t ucon; // control uint32_t ufcon; // FIFO control uint32_t umcon; // modem control uint32_t utrstat; // Tx/Rx status uint32_t uerstat; // Rx error status uint32_t ufstat; // FIFO status uint32_t umstat; // modem status uint32_t utxh; // transmit buffer uint32_t urxh; // receive buffer uint32_t ubrdiv; // baud rate divisor uint32_t ufracval; // divisor fractional value uint32_t uintp; // interrupt pending uint32_t uints; // interrupt source uint32_t uintm; // interrupt mask }; static struct s5p_uart *uart_regs; void serial_putchar(unsigned int c) { const uint32_t TxFifoFullBit = (0x1 << 24); while (readl(&uart_regs->ufstat) & TxFifoFullBit) {;} writeb(c, &uart_regs->utxh); if (c == '\n') serial_putchar('\r'); } int serial_havechar(void) { const uint32_t DataReadyMask = (0xf << 0) | (0x1 << 8); return (readl(&uart_regs->ufstat) & DataReadyMask) != 0; } int serial_getchar(void) { while (!serial_havechar()) {;} return readb(&uart_regs->urxh); } static struct console_output_driver s5p_serial_output = { .putchar = &serial_putchar }; static struct console_input_driver s5p_serial_input = { .havekey = &serial_havechar, .getchar = &serial_getchar }; void serial_init(void) { if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr) return; uart_regs = (struct s5p_uart *)lib_sysinfo.serial->baseaddr; } void serial_console_init(void) { serial_init(); if (uart_regs) { console_add_output_driver(&s5p_serial_output); console_add_input_driver(&s5p_serial_input); } }