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Linux/arch/mips/kernel/csrc-gic.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file "COPYING" in the main directory of this archive
  4  * for more details.
  5  *
  6  * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
  7  */
  8 #include <linux/init.h>
  9 #include <linux/time.h>
 10 
 11 #include <asm/gic.h>
 12 
 13 static cycle_t gic_hpt_read(struct clocksource *cs)
 14 {
 15         return gic_read_count();
 16 }
 17 
 18 static struct clocksource gic_clocksource = {
 19         .name   = "GIC",
 20         .read   = gic_hpt_read,
 21         .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
 22 };
 23 
 24 void __init gic_clocksource_init(unsigned int frequency)
 25 {
 26         unsigned int config, bits;
 27 
 28         /* Calculate the clocksource mask. */
 29         GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), config);
 30         bits = 32 + ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
 31                 (GIC_SH_CONFIG_COUNTBITS_SHF - 2));
 32 
 33         /* Set clocksource mask. */
 34         gic_clocksource.mask = CLOCKSOURCE_MASK(bits);
 35 
 36         /* Calculate a somewhat reasonable rating value. */
 37         gic_clocksource.rating = 200 + frequency / 10000000;
 38 
 39         clocksource_register_hz(&gic_clocksource, frequency);
 40 }
 41 

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