108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Copyright 2013 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <libpayload.h>
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#include <stdint.h>
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struct s5p_uart
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{
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uint32_t ulcon; // line control
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uint32_t ucon; // control
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uint32_t ufcon; // FIFO control
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uint32_t umcon; // modem control
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uint32_t utrstat; // Tx/Rx status
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uint32_t uerstat; // Rx error status
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uint32_t ufstat; // FIFO status
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uint32_t umstat; // modem status
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uint32_t utxh; // transmit buffer
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uint32_t urxh; // receive buffer
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uint32_t ubrdiv; // baud rate divisor
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uint32_t ufracval; // divisor fractional value
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uint32_t uintp; // interrupt pending
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uint32_t uints; // interrupt source
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uint32_t uintm; // interrupt mask
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};
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static struct s5p_uart *uart_regs;
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void serial_putchar(unsigned int c)
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{
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const uint32_t TxFifoFullBit = (0x1 << 24);
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while (readl(&uart_regs->ufstat) & TxFifoFullBit)
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{;}
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writeb(c, &uart_regs->utxh);
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if (c == '\n')
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serial_putchar('\r');
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}
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int serial_havechar(void)
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{
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const uint32_t DataReadyMask = (0xf << 0) | (0x1 << 8);
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return (readl(&uart_regs->ufstat) & DataReadyMask) != 0;
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}
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int serial_getchar(void)
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{
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while (!serial_havechar())
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{;}
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return readb(&uart_regs->urxh);
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}
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static struct console_output_driver s5p_serial_output =
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{
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.putchar = &serial_putchar
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};
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static struct console_input_driver s5p_serial_input =
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{
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.havekey = &serial_havechar,
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.getchar = &serial_getchar,
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.input_type = CONSOLE_INPUT_TYPE_UART,
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};
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void serial_init(void)
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{
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if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr)
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return;
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uart_regs = (struct s5p_uart *)lib_sysinfo.serial->baseaddr;
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}
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void serial_console_init(void)
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{
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serial_init();
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if (uart_regs) {
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console_add_output_driver(&s5p_serial_output);
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console_add_input_driver(&s5p_serial_input);
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}
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}
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