libpayload: Add minimal support for PL011 UART
This creates a new PL011 config variable which avoids the infinite busy wait on serial_putchar() because the register mapping is not compatible with current implementation. BUG=None BRANCH=none TEST=printf() works on the PL011 based ARMv8 foundation model Original-Change-Id: I9feda35a50a3488fc504d1561444161e0889deda Original-Signed-off-by: Marcelo Povoa <marcelogp@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/187020 Original-Reviewed-by: David Hendricks <dhendrix@chromium.org> (cherry picked from commit 85779a34a161c324cc8af995ada4393137275f20) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Conflicts: payloads/libpayload/Config.in payloads/libpayload/drivers/serial.c Change-Id: I23c8b3728cd7d2d7692b3e86a679e061e88f7bb5 Reviewed-on: http://review.coreboot.org/7422 Tested-by: build bot (Jenkins) Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Marcelo Povoa
Marc Jones
parent
d4d29a1a7e
commit
558e9b55c8
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@ -178,6 +178,11 @@ config TEGRA_SERIAL_CONSOLE
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depends on SERIAL_CONSOLE
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default n
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config PL011_SERIAL_CONSOLE
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bool "PL011 compatible serial port driver"
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depends on 8250_SERIAL_CONSOLE
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default n
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config SERIAL_IOBASE
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## This default is currently not used on non-x86 systems.
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hex "Default I/O base for the serial port (default 0x3f8)"
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@ -0,0 +1,250 @@
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/*
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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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#define IOBASE lib_sysinfo.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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#ifdef 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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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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#ifdef 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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writeb(val, MEMBASE + offset);
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}
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#ifdef 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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#ifndef 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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};
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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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if (!lib_sysinfo.serial)
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return;
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serial_is_mem_mapped =
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(lib_sysinfo.serial->type == CB_SERIAL_TYPE_MEMORY_MAPPED);
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if (!serial_is_mem_mapped) {
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#ifdef 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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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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serial_hardware_is_present = 1;
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#ifdef 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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}
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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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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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#ifndef 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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}
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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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/* These are thinly veiled vt100 functions used by curses */
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#define VT100_CLEAR "\e[H\e[J"
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/* These defines will fail if you use bold and reverse at the same time.
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* Switching off one of them will switch off both. tinycurses knows about
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* this and does the right thing.
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*/
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#define VT100_SBOLD "\e[1m"
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#define VT100_EBOLD "\e[m"
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#define VT100_SREVERSE "\e[7m"
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#define VT100_EREVERSE "\e[m"
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#define VT100_CURSOR_ADDR "\e[%d;%dH"
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#define VT100_CURSOR_ON "\e[?25l"
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#define VT100_CURSOR_OFF "\e[?25h"
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/* The following smacs/rmacs are actually for xterm; a real vt100 has
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enacs=\E(B\E)0, smacs=^N, rmacs=^O. */
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#define VT100_SMACS "\e(0"
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#define VT100_RMACS "\e(B"
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/* A vt100 doesn't do color, setaf/setab below are from xterm-color. */
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#define VT100_SET_COLOR "\e[3%d;4%dm"
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static void serial_putcmd(const char *str)
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{
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while (*str)
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serial_putchar(*(str++));
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}
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void serial_clear(void)
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{
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serial_putcmd(VT100_CLEAR);
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}
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void serial_start_bold(void)
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{
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serial_putcmd(VT100_SBOLD);
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}
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void serial_end_bold(void)
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{
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serial_putcmd(VT100_EBOLD);
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}
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void serial_start_reverse(void)
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{
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serial_putcmd(VT100_SREVERSE);
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}
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void serial_end_reverse(void)
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{
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serial_putcmd(VT100_EREVERSE);
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}
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void serial_start_altcharset(void)
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{
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serial_putcmd(VT100_SMACS);
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}
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void serial_end_altcharset(void)
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{
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serial_putcmd(VT100_RMACS);
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}
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/**
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* Set the foreground and background colors on the serial console.
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*
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* @param fg Foreground color number.
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* @param bg Background color number.
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*/
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void serial_set_color(short fg, short bg)
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{
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char buffer[32];
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snprintf(buffer, sizeof(buffer), VT100_SET_COLOR, fg, bg);
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serial_putcmd(buffer);
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}
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void serial_set_cursor(int y, int x)
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{
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char buffer[32];
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snprintf(buffer, sizeof(buffer), VT100_CURSOR_ADDR, y + 1, x + 1);
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serial_putcmd(buffer);
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}
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void serial_cursor_enable(int state)
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{
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if (state)
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serial_putcmd(VT100_CURSOR_ON);
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else
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serial_putcmd(VT100_CURSOR_OFF);
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}
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