forked from rubenslte/android_kernel_samsung_msm8226
Sudeep KarkadaNagesha
baafa54585
This patch adds support for configuring the event stream frequency and enabling it. It also adds the hwcaps definitions to the user to detect this event stream feature. Change-Id: I58a9bdc06fe51587c4264af256012b5f7f3af354 Cc: Russell King <linux@arm.linux.org.uk> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Olof Johansson <olof@lixom.net> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com> Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Git-commit: e9faebc66ec74f1ab7f267d683b45e80faa69763 Signed-off-by: Trilok Soni <tsoni@codeaurora.org> Signed-off-by: Matt Wagantall <mattw@codeaurora.org> Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>
82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#ifndef __ASMARM_ARCH_TIMER_H
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#define __ASMARM_ARCH_TIMER_H
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#include <linux/ioport.h>
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#include <linux/clocksource.h>
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#include <asm/errno.h>
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#define ARCH_TIMER_USR_PCT_ACCESS_EN (1 << 0) /* physical counter */
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#define ARCH_TIMER_USR_VCT_ACCESS_EN (1 << 1) /* virtual counter */
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#define ARCH_TIMER_VIRT_EVT_EN (1 << 2)
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#define ARCH_TIMER_EVT_TRIGGER_SHIFT (4)
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#define ARCH_TIMER_EVT_TRIGGER_MASK (0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
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#define ARCH_TIMER_USR_VT_ACCESS_EN (1 << 8) /* virtual timer registers */
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#define ARCH_TIMER_USR_PT_ACCESS_EN (1 << 9) /* physical timer registers */
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struct arch_timer {
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struct resource res[3];
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};
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#ifdef CONFIG_ARM_ARCH_TIMER
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int arch_timer_register(struct arch_timer *);
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int arch_timer_of_register(void);
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cycle_t arch_counter_get_cntpct(void);
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static inline u32 arch_timer_get_cntkctl(void)
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{
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u32 cntkctl;
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asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
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return cntkctl;
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}
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static inline void arch_timer_set_cntkctl(u32 cntkctl)
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{
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asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
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}
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static inline void arch_counter_set_user_access(void)
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{
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u32 cntkctl = arch_timer_get_cntkctl();
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/* Disable user access to the timers and the physical counter */
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/* Also disable virtual event stream */
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cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
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| ARCH_TIMER_USR_VT_ACCESS_EN
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| ARCH_TIMER_VIRT_EVT_EN
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| ARCH_TIMER_USR_PCT_ACCESS_EN);
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/* Enable user access to the virtual counter */
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cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
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arch_timer_set_cntkctl(cntkctl);
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}
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static inline void arch_timer_evtstrm_enable(int divider)
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{
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u32 cntkctl = arch_timer_get_cntkctl();
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cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
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/* Set the divider and enable virtual event stream */
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cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
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| ARCH_TIMER_VIRT_EVT_EN;
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arch_timer_set_cntkctl(cntkctl);
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elf_hwcap |= HWCAP_EVTSTRM;
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}
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#else
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static inline int arch_timer_register(struct arch_timer *at)
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{
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return -ENXIO;
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}
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static inline int arch_timer_of_register(void)
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{
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return -ENXIO;
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}
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static inline cycle_t arch_counter_get_cntpct(void)
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{
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return 0;
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}
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#endif
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#endif
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