172 lines
4.5 KiB
C
172 lines
4.5 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 Advanced Micro Devices, Inc.
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* Copyright (C) 2008 Ulf Jordan <jordan@chalmers.se>
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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-config.h>
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#include <libpayload.h>
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static struct cb_serial cb_serial;
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#define IOBASE cb_serial.baseaddr
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#define MEMBASE (phys_to_virt(IOBASE))
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static int serial_hardware_is_present = 0;
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static int serial_is_mem_mapped = 0;
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static uint8_t serial_read_reg(int offset)
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{
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offset *= cb_serial.regwidth;
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#if CONFIG(LP_IO_ADDRESS_SPACE)
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if (!serial_is_mem_mapped)
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return inb(IOBASE + offset);
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else
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#endif
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if (cb_serial.regwidth == 4)
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return readl(MEMBASE + offset) & 0xff;
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else
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return readb(MEMBASE + offset);
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}
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static void serial_write_reg(uint8_t val, int offset)
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{
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offset *= cb_serial.regwidth;
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#if CONFIG(LP_IO_ADDRESS_SPACE)
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if (!serial_is_mem_mapped)
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outb(val, IOBASE + offset);
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else
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#endif
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if (cb_serial.regwidth == 4)
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writel(val & 0xff, MEMBASE + offset);
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else
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writeb(val, MEMBASE + offset);
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}
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#if CONFIG(LP_SERIAL_SET_SPEED)
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static void serial_hardware_init(int speed, int word_bits,
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int parity, int stop_bits)
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{
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unsigned char reg;
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#if !CONFIG(LP_PL011_SERIAL_CONSOLE)
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/* Disable interrupts. */
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serial_write_reg(0, 0x01);
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/* Assert RTS and DTR. */
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serial_write_reg(3, 0x04);
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/* Set the divisor latch. */
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reg = serial_read_reg(0x03);
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serial_write_reg(reg | 0x80, 0x03);
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/* Write the divisor. */
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uint16_t divisor = 115200 / speed;
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serial_write_reg(divisor & 0xFF, 0x00);
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serial_write_reg(divisor >> 8, 0x01);
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/* Restore the previous value of the divisor.
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* And set 8 bits per character */
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serial_write_reg((reg & ~0x80) | 3, 0x03);
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#endif
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}
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#endif
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static struct console_input_driver consin = {
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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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static struct console_output_driver consout = {
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.putchar = &serial_putchar
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};
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void serial_init(void)
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{
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serial_is_mem_mapped = (cb_serial.type == CB_SERIAL_TYPE_MEMORY_MAPPED);
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if (!serial_is_mem_mapped) {
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#if CONFIG(LP_IO_ADDRESS_SPACE)
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if ((inb(IOBASE + 0x05) == 0xFF) &&
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(inb(IOBASE + 0x06) == 0xFF)) {
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printf("IO space mapped serial not present.");
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return;
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}
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#else
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printf("IO space mapped serial not supported.");
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return;
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#endif
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}
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#if CONFIG(LP_SERIAL_SET_SPEED)
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serial_hardware_init(CONFIG_LP_SERIAL_BAUD_RATE, 8, 0, 1);
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#endif
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serial_hardware_is_present = 1;
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}
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void serial_console_init(void)
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{
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if (!lib_sysinfo.serial)
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return;
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cb_serial = *lib_sysinfo.serial;
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serial_init();
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console_add_input_driver(&consin);
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console_add_output_driver(&consout);
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}
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void serial_putchar(unsigned int c)
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{
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if (!serial_hardware_is_present)
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return;
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#if !CONFIG(LP_PL011_SERIAL_CONSOLE)
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while ((serial_read_reg(0x05) & 0x20) == 0) ;
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#endif
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serial_write_reg(c, 0x00);
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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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if (!serial_hardware_is_present)
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return 0;
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return serial_read_reg(0x05) & 0x01;
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}
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int serial_getchar(void)
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{
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if (!serial_hardware_is_present)
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return -1;
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while (!serial_havechar()) ;
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return serial_read_reg(0x00);
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}
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