diff options
Diffstat (limited to 'payloads/libpayload/drivers/serial/8250.c')
| -rw-r--r-- | payloads/libpayload/drivers/serial/8250.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/serial/8250.c b/payloads/libpayload/drivers/serial/8250.c new file mode 100644 index 0000000000..a4c1b1a2ab --- /dev/null +++ b/payloads/libpayload/drivers/serial/8250.c @@ -0,0 +1,245 @@ +/* + * This file is part of the libpayload project. + * + * Copyright (C) 2008 Advanced Micro Devices, Inc. + * Copyright (C) 2008 Ulf Jordan <jordan@chalmers.se> + * + * 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-config.h> +#include <libpayload.h> + +#define IOBASE lib_sysinfo.serial->baseaddr +#define MEMBASE (phys_to_virt(IOBASE)) + +static int serial_hardware_is_present = 0; +static int serial_is_mem_mapped = 0; + +static uint8_t serial_read_reg(int offset) +{ +#ifdef CONFIG_LP_IO_ADDRESS_SPACE + if (!serial_is_mem_mapped) + return inb(IOBASE + offset); + else +#endif + return readb(MEMBASE + offset); +} + +static void serial_write_reg(uint8_t val, int offset) +{ +#ifdef CONFIG_LP_IO_ADDRESS_SPACE + if (!serial_is_mem_mapped) + outb(val, IOBASE + offset); + else +#endif + writeb(val, MEMBASE + offset); +} + +#ifdef CONFIG_LP_SERIAL_SET_SPEED +static void serial_hardware_init(int speed, int word_bits, + int parity, int stop_bits) +{ + unsigned char reg; + + /* Disable interrupts. */ + serial_write_reg(0, 0x01); + + /* Assert RTS and DTR. */ + serial_write_reg(3, 0x04); + + /* Set the divisor latch. */ + reg = serial_read_reg(0x03); + serial_write_reg(reg | 0x80, 0x03); + + /* Write the divisor. */ + uint16_t divisor = 115200 / speed; + serial_write_reg(divisor & 0xFF, 0x00); + serial_write_reg(divisor >> 8, 0x01); + + /* Restore the previous value of the divisor. + * And set 8 bits per character */ + serial_write_reg((reg & ~0x80) | 3, 0x03); +} +#endif + +static struct console_input_driver consin = { + .havekey = &serial_havechar, + .getchar = &serial_getchar +}; + +static struct console_output_driver consout = { + .putchar = &serial_putchar +}; + +void serial_init(void) +{ + if (!lib_sysinfo.serial) + return; + + serial_is_mem_mapped = + (lib_sysinfo.serial->type == CB_SERIAL_TYPE_MEMORY_MAPPED); + + if (!serial_is_mem_mapped) { +#ifdef CONFIG_LP_IO_ADDRESS_SPACE + if ((inb(IOBASE + 0x05) == 0xFF) && + (inb(IOBASE + 0x06) == 0xFF)) { + printf("IO space mapped serial not present."); + return; + } +#else + printf("IO space mapped serial not supported."); + return; +#endif + } + +#ifdef CONFIG_LP_SERIAL_SET_SPEED + serial_hardware_init(CONFIG_LP_SERIAL_BAUD_RATE, 8, 0, 1); +#endif +} + +void serial_console_init(void) +{ + if (!lib_sysinfo.serial) + return; + + serial_init(); + + console_add_input_driver(&consin); + console_add_output_driver(&consout); + serial_hardware_is_present = 1; +} + +void serial_putchar(unsigned int c) +{ + if (!serial_hardware_is_present) + return; + while ((serial_read_reg(0x05) & 0x20) == 0) ; + serial_write_reg(c, 0x00); +} + +int serial_havechar(void) +{ + if (!serial_hardware_is_present) + return 0; + return serial_read_reg(0x05) & 0x01; +} + +int serial_getchar(void) +{ + if (!serial_hardware_is_present) + return -1; + while (!serial_havechar()) ; + return serial_read_reg(0x00); +} + +/* These are thinly veiled vt100 functions used by curses */ + +#define VT100_CLEAR "\e[H\e[J" +/* These defines will fail if you use bold and reverse at the same time. + * Switching off one of them will switch off both. tinycurses knows about + * this and does the right thing. + */ +#define VT100_SBOLD "\e[1m" +#define VT100_EBOLD "\e[m" +#define VT100_SREVERSE "\e[7m" +#define VT100_EREVERSE "\e[m" +#define VT100_CURSOR_ADDR "\e[%d;%dH" +#define VT100_CURSOR_ON "\e[?25l" +#define VT100_CURSOR_OFF "\e[?25h" +/* The following smacs/rmacs are actually for xterm; a real vt100 has + enacs=\E(B\E)0, smacs=^N, rmacs=^O. */ +#define VT100_SMACS "\e(0" +#define VT100_RMACS "\e(B" +/* A vt100 doesn't do color, setaf/setab below are from xterm-color. */ +#define VT100_SET_COLOR "\e[3%d;4%dm" + +static void serial_putcmd(const char *str) +{ + while (*str) + serial_putchar(*(str++)); +} + +void serial_clear(void) +{ + serial_putcmd(VT100_CLEAR); +} + +void serial_start_bold(void) +{ + serial_putcmd(VT100_SBOLD); +} + +void serial_end_bold(void) +{ + serial_putcmd(VT100_EBOLD); +} + +void serial_start_reverse(void) +{ + serial_putcmd(VT100_SREVERSE); +} + +void serial_end_reverse(void) +{ + serial_putcmd(VT100_EREVERSE); +} + +void serial_start_altcharset(void) +{ + serial_putcmd(VT100_SMACS); +} + +void serial_end_altcharset(void) +{ + serial_putcmd(VT100_RMACS); +} + +/** + * Set the foreground and background colors on the serial console. + * + * @param fg Foreground color number. + * @param bg Background color number. + */ +void serial_set_color(short fg, short bg) +{ + char buffer[32]; + snprintf(buffer, sizeof(buffer), VT100_SET_COLOR, fg, bg); + serial_putcmd(buffer); +} + +void serial_set_cursor(int y, int x) +{ + char buffer[32]; + snprintf(buffer, sizeof(buffer), VT100_CURSOR_ADDR, y + 1, x + 1); + serial_putcmd(buffer); +} + +void serial_cursor_enable(int state) +{ + if (state) + serial_putcmd(VT100_CURSOR_ON); + else + serial_putcmd(VT100_CURSOR_OFF); +} |