2 * Cobalt time initialization.
4 * Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #include <linux/i8253.h>
21 #include <linux/init.h>
23 #include <asm/gt64120.h>
26 #define GT641XX_BASE_CLOCK 50000000 /* 50MHz */
28 void __init
plat_time_init(void)
35 gt641xx_set_base_clock(GT641XX_BASE_CLOCK
);
38 * MIPS counter frequency is measured during a 100msec interval
39 * using GT64111 timer0.
41 while (!gt641xx_timer0_state())
44 start
= read_c0_count();
47 while (!gt641xx_timer0_state())
50 end
= read_c0_count();
52 mips_hpt_frequency
= (end
- start
) * 10;
53 printk(KERN_INFO
"MIPS counter frequency %dHz\n", mips_hpt_frequency
);
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