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grub/grub-core/term/ieee1275/escc.c
Vladimir 'phcoder' Serbinenko 61c42af084 ESCC serial driver for conducting sautomated tests in qemu. 
Not tested on real hardware.

	* include/grub/serial.h (grub_serial_port): New field escc_desc.
	* grub-core/term/ieee1275/escc.c: New file.
	* grub-core/Makefile.core.def (escc): New module.
2012-06-08 19:42:59 +02:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007,2008,2009,2010,2012 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/serial.h>
#include <grub/types.h>
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/time.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
struct grub_escc_descriptor
{
volatile grub_uint8_t *escc_ctrl;
volatile grub_uint8_t *escc_data;
};
static void
do_real_config (struct grub_serial_port *port)
{
grub_uint8_t bitsspec;
grub_uint8_t parity_stop_spec;
if (port->configured)
return;
/* Make sure the port is waiting for address now. */
(void) *port->escc_desc->escc_ctrl;
switch (port->config.speed)
{
case 57600:
*port->escc_desc->escc_ctrl = 13;
*port->escc_desc->escc_ctrl = 0;
*port->escc_desc->escc_ctrl = 12;
*port->escc_desc->escc_ctrl = 0;
*port->escc_desc->escc_ctrl = 14;
*port->escc_desc->escc_ctrl = 1;
*port->escc_desc->escc_ctrl = 11;
*port->escc_desc->escc_ctrl = 0x50;
break;
case 38400:
*port->escc_desc->escc_ctrl = 13;
*port->escc_desc->escc_ctrl = 0;
*port->escc_desc->escc_ctrl = 12;
*port->escc_desc->escc_ctrl = 1;
*port->escc_desc->escc_ctrl = 14;
*port->escc_desc->escc_ctrl = 1;
*port->escc_desc->escc_ctrl = 11;
*port->escc_desc->escc_ctrl = 0x50;
break;
}
parity_stop_spec = 0;
switch (port->config.parity)
{
case GRUB_SERIAL_PARITY_NONE:
parity_stop_spec |= 0;
break;
case GRUB_SERIAL_PARITY_ODD:
parity_stop_spec |= 1;
break;
case GRUB_SERIAL_PARITY_EVEN:
parity_stop_spec |= 3;
break;
}
switch (port->config.stop_bits)
{
case GRUB_SERIAL_STOP_BITS_1:
parity_stop_spec |= 0x4;
break;
case GRUB_SERIAL_STOP_BITS_1_5:
parity_stop_spec |= 0x8;
break;
case GRUB_SERIAL_STOP_BITS_2:
parity_stop_spec |= 0xc;
break;
}
*port->escc_desc->escc_ctrl = 4;
*port->escc_desc->escc_ctrl = 0x40 | parity_stop_spec;
bitsspec = port->config.word_len - 5;
bitsspec = ((bitsspec >> 1) | (bitsspec << 1)) & 3;
*port->escc_desc->escc_ctrl = 3;
*port->escc_desc->escc_ctrl = (bitsspec << 6) | 0x1;
port->configured = 1;
return;
}
/* Fetch a key. */
static int
serial_hw_fetch (struct grub_serial_port *port)
{
do_real_config (port);
*port->escc_desc->escc_ctrl = 0;
if (*port->escc_desc->escc_ctrl & 1)
return *port->escc_desc->escc_data;
return -1;
}
/* Put a character. */
static void
serial_hw_put (struct grub_serial_port *port, const int c)
{
grub_uint64_t endtime;
do_real_config (port);
if (port->broken > 5)
endtime = grub_get_time_ms ();
else if (port->broken > 1)
endtime = grub_get_time_ms () + 50;
else
endtime = grub_get_time_ms () + 200;
/* Wait until the transmitter holding register is empty. */
while (1)
{
*port->escc_desc->escc_ctrl = 0;
if (*port->escc_desc->escc_ctrl & 4)
break;
if (grub_get_time_ms () > endtime)
{
port->broken++;
/* There is something wrong. But what can I do? */
return;
}
}
if (port->broken)
port->broken--;
*port->escc_desc->escc_data = c;
}
/* 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_configure (struct grub_serial_port *port __attribute__ ((unused)),
struct grub_serial_config *config __attribute__ ((unused)))
{
if (config->speed != 38400 && config->speed != 57600)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port speed"));
if (config->parity != GRUB_SERIAL_PARITY_NONE
&& config->parity != GRUB_SERIAL_PARITY_ODD
&& config->parity != GRUB_SERIAL_PARITY_EVEN)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port parity"));
if (config->stop_bits != GRUB_SERIAL_STOP_BITS_1
&& config->stop_bits != GRUB_SERIAL_STOP_BITS_1_5
&& config->stop_bits != GRUB_SERIAL_STOP_BITS_2)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port stop bits number"));
if (config->word_len < 5 || config->word_len > 8)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unsupported serial port word length"));
port->config = *config;
port->configured = 0;
/* FIXME: should check if the serial terminal was found. */
return GRUB_ERR_NONE;
}
struct grub_serial_driver grub_escc_driver =
{
.configure = serial_hw_configure,
.fetch = serial_hw_fetch,
.put = serial_hw_put
};
static struct grub_escc_descriptor escc_descs[2];
static void
add_device (grub_addr_t addr, int channel)
{
struct grub_serial_port *port;
grub_err_t err;
struct grub_serial_config config =
{
.speed = 38400,
.word_len = 8,
.parity = GRUB_SERIAL_PARITY_NONE,
.stop_bits = GRUB_SERIAL_STOP_BITS_1
};
escc_descs[channel].escc_ctrl
= (volatile grub_uint8_t *) (grub_addr_t) addr;
escc_descs[channel].escc_data = escc_descs[channel].escc_ctrl + 16;
port = grub_zalloc (sizeof (*port));
if (!port)
{
grub_errno = 0;
return;
}
port->name = grub_xasprintf ("escc-ch-%c", channel + 'a');
if (!port->name)
{
grub_errno = 0;
return;
}
port->escc_desc = &escc_descs[channel];
port->driver = &grub_escc_driver;
err = port->driver->configure (port, &config);
if (err)
grub_print_error ();
grub_serial_register (port);
}
GRUB_MOD_INIT (escc)
{
char *macio = 0;
char *escc = 0;
grub_uint32_t macio_addr[4];
grub_uint32_t escc_addr[2];
grub_ieee1275_phandle_t dev;
auto int find_macio (struct grub_ieee1275_devalias *alias);
auto int find_escc (struct grub_ieee1275_devalias *alias);
int find_macio (struct grub_ieee1275_devalias *alias)
{
if (grub_strcmp (alias->type, "mac-io") != 0)
return 0;
macio = grub_strdup (alias->path);
return 1;
}
int find_escc (struct grub_ieee1275_devalias *alias)
{
if (grub_strcmp (alias->type, "escc") != 0)
return 0;
escc = grub_strdup (alias->path);
return 1;
}
grub_ieee1275_devices_iterate (find_macio);
if (!macio)
return;
grub_children_iterate (macio, find_escc);
if (!escc)
{
grub_free (macio);
return;
}
if (grub_ieee1275_finddevice (macio, &dev))
{
grub_free (macio);
grub_free (escc);
return;
}
if (grub_ieee1275_get_integer_property (dev, "assigned-addresses",
macio_addr, sizeof (macio_addr), 0))
{
grub_free (macio);
grub_free (escc);
return;
}
if (grub_ieee1275_finddevice (escc, &dev))
{
grub_free (macio);
grub_free (escc);
return;
}
if (grub_ieee1275_get_integer_property (dev, "reg",
escc_addr, sizeof (escc_addr), 0))
{
grub_free (macio);
grub_free (escc);
return;
}
add_device (macio_addr[2] + escc_addr[0] + 32, 1);
add_device (macio_addr[2] + escc_addr[0], 0);
grub_free (macio);
grub_free (escc);
}
GRUB_MOD_FINI (escc)
{
}
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