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dfa762e1c3
Reorganize some of the GIC clocksource driver code. Below is a list of
the various changes.
* No longer select CSRC_GIC by default for Malta platform.
* Limit choice for either the GIC or R4K clocksource, not both.
* Change location in Makefile.
* Created new 'gic_read_count' function in common 'irq-gic.c' file.
* Change 'git_hpt_read' function in 'csrc-gic.c' to use new function.
* Surround GIC specific code in Malta platform code with #ifdef's.
* Only initialize the GIC clocksource if it was selected. Original
code called it unconditionally if a GIC was found.
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/time.h>
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#include <asm/gic.h>
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static cycle_t gic_hpt_read(struct clocksource *cs)
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{
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return gic_read_count();
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}
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static struct clocksource gic_clocksource = {
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.name = "GIC",
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.read = gic_hpt_read,
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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void __init gic_clocksource_init(unsigned int frequency)
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{
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unsigned int config, bits;
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/* Calculate the clocksource mask. */
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GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), config);
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bits = 32 + ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
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(GIC_SH_CONFIG_COUNTBITS_SHF - 2));
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/* Set clocksource mask. */
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gic_clocksource.mask = CLOCKSOURCE_MASK(bits);
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/* Calculate a somewhat reasonable rating value. */
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gic_clocksource.rating = 200 + frequency / 10000000;
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clocksource_register_hz(&gic_clocksource, frequency);
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}
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