399 lines
11 KiB
C
399 lines
11 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/machine/memory.h>
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#include <grub/serial.h>
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#include <grub/term.h>
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#include <grub/types.h>
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/terminfo.h>
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#include <grub/cpu/io.h>
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#include <grub/extcmd.h>
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#include <grub/i18n.h>
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static unsigned int registered = 0;
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/* Argument options. */
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static const struct grub_arg_option options[] =
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{
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{"unit", 'u', 0, N_("Set the serial unit."), 0, ARG_TYPE_INT},
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{"port", 'p', 0, N_("Set the serial port address."), 0, ARG_TYPE_STRING},
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{"speed", 's', 0, N_("Set the serial port speed."), 0, ARG_TYPE_INT},
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{"word", 'w', 0, N_("Set the serial port word length."), 0, ARG_TYPE_INT},
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{"parity", 'r', 0, N_("Set the serial port parity."), 0, ARG_TYPE_STRING},
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{"stop", 't', 0, N_("Set the serial port stop bits."), 0, ARG_TYPE_INT},
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{0, 0, 0, 0, 0, 0}
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};
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/* Serial port settings. */
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struct serial_port
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{
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grub_port_t port;
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unsigned short divisor;
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unsigned short word_len;
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unsigned int parity;
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unsigned short stop_bits;
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};
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/* Serial port settings. */
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static struct serial_port serial_settings;
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#ifdef GRUB_MACHINE_PCBIOS
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static const unsigned short *serial_hw_io_addr = (const unsigned short *) GRUB_MEMORY_MACHINE_BIOS_DATA_AREA_ADDR;
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#define GRUB_SERIAL_PORT_NUM 4
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#else
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#include <grub/machine/serial.h>
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static const grub_port_t serial_hw_io_addr[] = GRUB_MACHINE_SERIAL_PORTS;
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#define GRUB_SERIAL_PORT_NUM (ARRAY_SIZE(serial_hw_io_addr))
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#endif
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/* Return the port number for the UNITth serial device. */
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static inline grub_port_t
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serial_hw_get_port (const unsigned int unit)
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{
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if (unit < GRUB_SERIAL_PORT_NUM)
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return serial_hw_io_addr[unit];
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else
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return 0;
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}
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/* Fetch a key. */
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static int
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serial_hw_fetch (void)
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{
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if (grub_inb (serial_settings.port + UART_LSR) & UART_DATA_READY)
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return grub_inb (serial_settings.port + UART_RX);
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return -1;
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}
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/* Put a character. */
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static void
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serial_hw_put (const int c)
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{
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unsigned int timeout = 100000;
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/* Wait until the transmitter holding register is empty. */
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while ((grub_inb (serial_settings.port + UART_LSR) & UART_EMPTY_TRANSMITTER) == 0)
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{
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if (--timeout == 0)
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/* There is something wrong. But what can I do? */
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return;
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}
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grub_outb (c, serial_settings.port + UART_TX);
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}
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/* Convert speed to divisor. */
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static unsigned short
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serial_get_divisor (unsigned int speed)
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{
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unsigned int i;
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/* The structure for speed vs. divisor. */
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struct divisor
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{
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unsigned int speed;
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unsigned short div;
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};
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/* The table which lists common configurations. */
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/* 1843200 / (speed * 16) */
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static struct divisor divisor_tab[] =
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{
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{ 2400, 0x0030 },
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{ 4800, 0x0018 },
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{ 9600, 0x000C },
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{ 19200, 0x0006 },
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{ 38400, 0x0003 },
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{ 57600, 0x0002 },
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{ 115200, 0x0001 }
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};
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/* Set the baud rate. */
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for (i = 0; i < sizeof (divisor_tab) / sizeof (divisor_tab[0]); i++)
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if (divisor_tab[i].speed == speed)
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/* UART in Yeeloong runs twice the usual rate. */
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#ifdef GRUB_MACHINE_MIPS_YEELOONG
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return 2 * divisor_tab[i].div;
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#else
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return divisor_tab[i].div;
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#endif
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return 0;
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}
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/* Initialize a serial device. PORT is the port number for a serial device.
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SPEED is a DTE-DTE speed which must be one of these: 2400, 4800, 9600,
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19200, 38400, 57600 and 115200. WORD_LEN is the word length to be used
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for the device. Likewise, PARITY is the type of the parity and
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STOP_BIT_LEN is the length of the stop bit. The possible values for
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WORD_LEN, PARITY and STOP_BIT_LEN are defined in the header file as
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macros. */
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static grub_err_t
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serial_hw_init (void)
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{
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unsigned char status = 0;
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/* Turn off the interrupt. */
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grub_outb (0, serial_settings.port + UART_IER);
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/* Set DLAB. */
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grub_outb (UART_DLAB, serial_settings.port + UART_LCR);
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/* Set the baud rate. */
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grub_outb (serial_settings.divisor & 0xFF, serial_settings.port + UART_DLL);
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grub_outb (serial_settings.divisor >> 8, serial_settings.port + UART_DLH);
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/* Set the line status. */
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status |= (serial_settings.parity
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| serial_settings.word_len
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| serial_settings.stop_bits);
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grub_outb (status, serial_settings.port + UART_LCR);
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/* In Yeeloong serial port has only 3 wires. */
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#ifndef GRUB_MACHINE_MIPS_YEELOONG
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/* Enable the FIFO. */
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grub_outb (UART_ENABLE_FIFO_TRIGGER1, serial_settings.port + UART_FCR);
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/* Turn on DTR and RTS. */
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grub_outb (UART_ENABLE_DTRRTS, serial_settings.port + UART_MCR);
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#else
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/* Enable the FIFO. */
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grub_outb (UART_ENABLE_FIFO_TRIGGER14, serial_settings.port + UART_FCR);
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/* Turn on DTR, RTS, and OUT2. */
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grub_outb (UART_ENABLE_DTRRTS | UART_ENABLE_OUT2,
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serial_settings.port + UART_MCR);
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#endif
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/* Drain the input buffer. */
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while (serial_hw_fetch () != -1);
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/* FIXME: should check if the serial terminal was found. */
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return GRUB_ERR_NONE;
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}
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static grub_uint16_t
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grub_serial_getwh (struct grub_term_output *term __attribute__ ((unused)))
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{
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const grub_uint8_t TEXT_WIDTH = 80;
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const grub_uint8_t TEXT_HEIGHT = 24;
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return (TEXT_WIDTH << 8) | TEXT_HEIGHT;
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}
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struct grub_terminfo_input_state grub_serial_terminfo_input =
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{
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.readkey = serial_hw_fetch
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};
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struct grub_terminfo_output_state grub_serial_terminfo_output =
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{
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.put = serial_hw_put
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};
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static struct grub_term_input grub_serial_term_input =
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{
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.name = "serial",
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.init = grub_terminfo_input_init,
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.checkkey = grub_terminfo_checkkey,
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.getkey = grub_terminfo_getkey,
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.data = &grub_serial_terminfo_input
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};
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static struct grub_term_output grub_serial_term_output =
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{
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.name = "serial",
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.putchar = grub_terminfo_putchar,
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.getwh = grub_serial_getwh,
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.getxy = grub_terminfo_getxy,
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.gotoxy = grub_terminfo_gotoxy,
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.cls = grub_terminfo_cls,
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.setcolorstate = grub_terminfo_setcolorstate,
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.setcursor = grub_terminfo_setcursor,
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.flags = GRUB_TERM_CODE_TYPE_ASCII,
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.data = &grub_serial_terminfo_output,
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.normal_color = GRUB_TERM_DEFAULT_NORMAL_COLOR,
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.highlight_color = GRUB_TERM_DEFAULT_HIGHLIGHT_COLOR,
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};
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static grub_err_t
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grub_cmd_serial (grub_extcmd_t cmd,
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int argc __attribute__ ((unused)),
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char **args __attribute__ ((unused)))
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{
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struct grub_arg_list *state = cmd->state;
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struct serial_port backup_settings = serial_settings;
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grub_err_t hwiniterr;
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if (state[0].set)
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{
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unsigned int unit;
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unit = grub_strtoul (state[0].arg, 0, 0);
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serial_settings.port = serial_hw_get_port (unit);
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if (!serial_settings.port)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad unit number");
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}
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if (state[1].set)
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serial_settings.port = (grub_port_t) grub_strtoul (state[1].arg, 0, 0);
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if (state[2].set)
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{
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unsigned long speed;
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speed = grub_strtoul (state[2].arg, 0, 0);
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serial_settings.divisor = serial_get_divisor ((unsigned int) speed);
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if (serial_settings.divisor == 0)
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{
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serial_settings = backup_settings;
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad speed");
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}
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}
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if (state[3].set)
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{
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if (! grub_strcmp (state[3].arg, "5"))
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serial_settings.word_len = UART_5BITS_WORD;
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else if (! grub_strcmp (state[3].arg, "6"))
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serial_settings.word_len = UART_6BITS_WORD;
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else if (! grub_strcmp (state[3].arg, "7"))
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serial_settings.word_len = UART_7BITS_WORD;
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else if (! grub_strcmp (state[3].arg, "8"))
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serial_settings.word_len = UART_8BITS_WORD;
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else
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{
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serial_settings = backup_settings;
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad word length");
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}
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}
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if (state[4].set)
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{
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if (! grub_strcmp (state[4].arg, "no"))
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serial_settings.parity = UART_NO_PARITY;
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else if (! grub_strcmp (state[4].arg, "odd"))
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serial_settings.parity = UART_ODD_PARITY;
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else if (! grub_strcmp (state[4].arg, "even"))
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serial_settings.parity = UART_EVEN_PARITY;
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else
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{
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serial_settings = backup_settings;
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad parity");
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}
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}
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if (state[5].set)
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{
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if (! grub_strcmp (state[5].arg, "1"))
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serial_settings.stop_bits = UART_1_STOP_BIT;
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else if (! grub_strcmp (state[5].arg, "2"))
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serial_settings.stop_bits = UART_2_STOP_BITS;
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else
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{
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serial_settings = backup_settings;
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "bad number of stop bits");
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}
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}
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/* Initialize with new settings. */
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hwiniterr = serial_hw_init ();
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if (hwiniterr == GRUB_ERR_NONE)
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{
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/* Register terminal if not yet registered. */
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if (registered == 0)
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{
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grub_term_register_input ("serial", &grub_serial_term_input);
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grub_term_register_output ("serial", &grub_serial_term_output);
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grub_terminfo_output_register (&grub_serial_term_output, "vt100");
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registered = 1;
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}
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}
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else
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{
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/* Initialization with new settings failed. */
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if (registered == 1)
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{
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/* If the terminal is registered, attempt to restore previous
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settings. */
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serial_settings = backup_settings;
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if (serial_hw_init () != GRUB_ERR_NONE)
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{
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/* If unable to restore settings, unregister terminal. */
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grub_term_unregister_input (&grub_serial_term_input);
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grub_term_unregister_output (&grub_serial_term_output);
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grub_terminfo_output_unregister (&grub_serial_term_output);
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registered = 0;
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}
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}
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}
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return hwiniterr;
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}
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static grub_extcmd_t cmd;
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GRUB_MOD_INIT(serial)
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{
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cmd = grub_register_extcmd ("serial", grub_cmd_serial,
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GRUB_COMMAND_FLAG_BOTH,
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N_("[OPTIONS...]"),
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N_("Configure serial port."), options);
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/* Set default settings. */
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serial_settings.port = serial_hw_get_port (0);
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#ifdef GRUB_MACHINE_MIPS_YEELOONG
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serial_settings.divisor = serial_get_divisor (115200);
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#else
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serial_settings.divisor = serial_get_divisor (9600);
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#endif
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serial_settings.word_len = UART_8BITS_WORD;
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serial_settings.parity = UART_NO_PARITY;
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serial_settings.stop_bits = UART_1_STOP_BIT;
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#ifdef GRUB_MACHINE_MIPS_YEELOONG
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{
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grub_err_t hwiniterr;
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hwiniterr = serial_hw_init ();
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if (hwiniterr == GRUB_ERR_NONE)
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{
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grub_term_register_input_active ("serial", &grub_serial_term_input);
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grub_term_register_output_active ("serial", &grub_serial_term_output);
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registered = 1;
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}
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}
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#endif
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}
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GRUB_MOD_FINI(serial)
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{
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grub_unregister_extcmd (cmd);
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if (registered == 1) /* Unregister terminal only if registered. */
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{
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grub_term_unregister_input (&grub_serial_term_input);
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grub_term_unregister_output (&grub_serial_term_output);
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grub_terminfo_output_unregister (&grub_serial_term_output);
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}
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}
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