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