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avr32: Generic clockevents support

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This combines three patches from David Brownell:
  * avr32: tclib support
  * avr32: simplify clocksources
  * avr32: Turn count/compare into a oneshot clockevent device

Register both TC blocks (instead of just the first one) so that
the AT32/AT91 tclib code will pick them up (instead of just the
avr32-only PIT-style clocksource).

Rename the first one and its resources appropriately.

More cleanups to the cycle counter clocksource code

 - Disable all the weak symbol magic; remove the AVR32-only TCB-based
   clocksource code (source and header).

 - Mark the __init code properly.

 - Don't forget to report IRQF_TIMER.

 - Make the system work properly with this clocksource, by preventing
   use of the CPU "idle" sleep state in the idle loop when it's used.

Package the avr32 count/compare timekeeping support as a oneshot
clockevent device, so it supports NO_HZ and high res timers.
This means it also supports plugging in other clockevent devices
and clocksources.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
David Brownell
2008-02-14 11:24:02 -08:00
committed by Haavard Skinnemoen
parent 7e59128f31
commit e723ff666a
6 changed files with 117 additions and 477 deletions
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include/asm-avr32/arch-at32ap/time.h
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@@ -1,112 +0,0 @@
/*
* Copyright (C) 2007 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASM_AVR32_ARCH_AT32AP_TIME_H
#define _ASM_AVR32_ARCH_AT32AP_TIME_H
#include <linux/platform_device.h>
extern struct irqaction timer_irqaction;
extern struct platform_device at32_systc0_device;
extern void local_timer_interrupt(int irq, void *dev_id);
#define TIMER_BCR 0x000000c0
#define TIMER_BCR_SYNC 0
#define TIMER_BMR 0x000000c4
#define TIMER_BMR_TC0XC0S 0
#define TIMER_BMR_TC1XC1S 2
#define TIMER_BMR_TC2XC2S 4
#define TIMER_CCR 0x00000000
#define TIMER_CCR_CLKDIS 1
#define TIMER_CCR_CLKEN 0
#define TIMER_CCR_SWTRG 2
#define TIMER_CMR 0x00000004
#define TIMER_CMR_ABETRG 10
#define TIMER_CMR_ACPA 16
#define TIMER_CMR_ACPC 18
#define TIMER_CMR_AEEVT 20
#define TIMER_CMR_ASWTRG 22
#define TIMER_CMR_BCPB 24
#define TIMER_CMR_BCPC 26
#define TIMER_CMR_BEEVT 28
#define TIMER_CMR_BSWTRG 30
#define TIMER_CMR_BURST 4
#define TIMER_CMR_CLKI 3
#define TIMER_CMR_CPCDIS 7
#define TIMER_CMR_CPCSTOP 6
#define TIMER_CMR_CPCTRG 14
#define TIMER_CMR_EEVT 10
#define TIMER_CMR_EEVTEDG 8
#define TIMER_CMR_ENETRG 12
#define TIMER_CMR_ETRGEDG 8
#define TIMER_CMR_LDBDIS 7
#define TIMER_CMR_LDBSTOP 6
#define TIMER_CMR_LDRA 16
#define TIMER_CMR_LDRB 18
#define TIMER_CMR_TCCLKS 0
#define TIMER_CMR_WAVE 15
#define TIMER_CMR_WAVSEL 13
#define TIMER_CV 0x00000010
#define TIMER_CV_CV 0
#define TIMER_IDR 0x00000028
#define TIMER_IDR_COVFS 0
#define TIMER_IDR_CPAS 2
#define TIMER_IDR_CPBS 3
#define TIMER_IDR_CPCS 4
#define TIMER_IDR_ETRGS 7
#define TIMER_IDR_LDRAS 5
#define TIMER_IDR_LDRBS 6
#define TIMER_IDR_LOVRS 1
#define TIMER_IER 0x00000024
#define TIMER_IER_COVFS 0
#define TIMER_IER_CPAS 2
#define TIMER_IER_CPBS 3
#define TIMER_IER_CPCS 4
#define TIMER_IER_ETRGS 7
#define TIMER_IER_LDRAS 5
#define TIMER_IER_LDRBS 6
#define TIMER_IER_LOVRS 1
#define TIMER_IMR 0x0000002c
#define TIMER_IMR_COVFS 0
#define TIMER_IMR_CPAS 2
#define TIMER_IMR_CPBS 3
#define TIMER_IMR_CPCS 4
#define TIMER_IMR_ETRGS 7
#define TIMER_IMR_LDRAS 5
#define TIMER_IMR_LDRBS 6
#define TIMER_IMR_LOVRS 1
#define TIMER_RA 0x00000014
#define TIMER_RA_RA 0
#define TIMER_RB 0x00000018
#define TIMER_RB_RB 0
#define TIMER_RC 0x0000001c
#define TIMER_RC_RC 0
#define TIMER_SR 0x00000020
#define TIMER_SR_CLKSTA 16
#define TIMER_SR_COVFS 0
#define TIMER_SR_CPAS 2
#define TIMER_SR_CPBS 3
#define TIMER_SR_CPCS 4
#define TIMER_SR_ETRGS 7
#define TIMER_SR_LDRAS 5
#define TIMER_SR_LDRBS 6
#define TIMER_SR_LOVRS 1
#define TIMER_SR_MTIOA 17
#define TIMER_SR_MTIOB 18
/* Bit manipulation macros */
#define TIMER_BIT(name) (1 << TIMER_##name)
#define TIMER_BF(name,value) ((value) << TIMER_##name)
/* Register access macros */
#define timer_read(port,instance,reg) \
__raw_readl(port + (0x40 * instance) + TIMER_##reg)
#define timer_write(port,instance,reg,value) \
__raw_writel((value), port + (0x40 * instance) + TIMER_##reg)
#endif /* _ASM_AVR32_ARCH_AT32AP_TIME_H */