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54 lines
1.4 KiB
54 lines
1.4 KiB
/* |
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* Cobalt time initialization. |
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* |
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* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org> |
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* |
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* This program 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 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program 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 this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <linux/i8253.h> |
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#include <linux/init.h> |
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#include <asm/gt64120.h> |
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#include <asm/time.h> |
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#define GT641XX_BASE_CLOCK 50000000 /* 50MHz */ |
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void __init plat_time_init(void) |
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{ |
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u32 start, end; |
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int i = HZ / 10; |
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setup_pit_timer(); |
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gt641xx_set_base_clock(GT641XX_BASE_CLOCK); |
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/* |
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* MIPS counter frequency is measured during a 100msec interval |
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* using GT64111 timer0. |
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*/ |
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while (!gt641xx_timer0_state()) |
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; |
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start = read_c0_count(); |
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while (i--) |
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while (!gt641xx_timer0_state()) |
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; |
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end = read_c0_count(); |
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mips_hpt_frequency = (end - start) * 10; |
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printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency); |
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}
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