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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2011 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/datetime.h>
#include <grub/cmos.h>
#include <grub/dl.h>
#include <grub/ieee1275/ieee1275.h>
#include <grub/misc.h>
volatile grub_uint8_t *grub_cmos_port = 0;
/* Helper for grub_cmos_find_port. */
static int
grub_cmos_find_port_iter (struct grub_ieee1275_devalias *alias)
{
grub_ieee1275_phandle_t dev;
grub_uint32_t addr[2];
grub_ssize_t actual;
/* Enough to check if it's "m5819" */
char compat[100];
if (grub_ieee1275_finddevice (alias->path, &dev))
return 0;
if (grub_ieee1275_get_property (dev, "compatible", compat, sizeof (compat),
0))
return 0;
if (grub_strcmp (compat, "m5819") != 0)
return 0;
if (grub_ieee1275_get_integer_property (dev, "address",
addr, sizeof (addr), &actual))
return 0;
if (actual == 4)
{
grub_cmos_port = (volatile grub_uint8_t *) (grub_addr_t) addr[0];
return 1;
}
#if GRUB_CPU_SIZEOF_VOID_P == 8
if (actual == 8)
{
grub_cmos_port = (volatile grub_uint8_t *)
((((grub_addr_t) addr[0]) << 32) | addr[1]);
return 1;
}
#else
if (actual == 8 && addr[0] == 0)
{
grub_cmos_port = (volatile grub_uint8_t *) addr[1];
return 1;
}
#endif
return 0;
}
grub_err_t
grub_cmos_find_port (void)
{
grub_ieee1275_devices_iterate (grub_cmos_find_port_iter);
if (!grub_cmos_port)
return grub_error (GRUB_ERR_IO, "no cmos found");
return GRUB_ERR_NONE;
}
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