| Message ID | 1422881149-8177-18-git-send-email-hanjun.guo@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Monday, February 02, 2015 08:45:45 PM Hanjun Guo wrote: > Using the information presented by GTDT (Generic Timer Description Table) > to initialize the arch timer (not memory-mapped). > > CC: Daniel Lezcano <daniel.lezcano@linaro.org> > Originally-by: Amit Daniel Kachhap <amit.daniel@samsung.com> > Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> > Tested-by: Yijing Wang <wangyijing@huawei.com> > Tested-by: Mark Langsdorf <mlangsdo@redhat.com> > Tested-by: Jon Masters <jcm@redhat.com> > Tested-by: Timur Tabi <timur@codeaurora.org> > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> > --- > arch/arm64/kernel/time.c | 7 ++ > drivers/clocksource/arm_arch_timer.c | 132 ++++++++++++++++++++++++++++------- An ACK from Thomas Gleixner is necessary for that. > include/linux/clocksource.h | 6 ++ > 3 files changed, 118 insertions(+), 27 deletions(-) > > diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c > index 1a7125c..42f9195 100644 > --- a/arch/arm64/kernel/time.c > +++ b/arch/arm64/kernel/time.c > @@ -35,6 +35,7 @@ > #include <linux/delay.h> > #include <linux/clocksource.h> > #include <linux/clk-provider.h> > +#include <linux/acpi.h> > > #include <clocksource/arm_arch_timer.h> > > @@ -72,6 +73,12 @@ void __init time_init(void) > > tick_setup_hrtimer_broadcast(); > > + /* > + * Since ACPI or FDT will only one be available in the system, > + * we can use acpi_generic_timer_init() here safely > + */ > + acpi_generic_timer_init(); > + > arch_timer_rate = arch_timer_get_rate(); > if (!arch_timer_rate) > panic("Unable to initialise architected timer.\n"); > diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c > index 095c177..407aa63 100644 > --- a/drivers/clocksource/arm_arch_timer.c > +++ b/drivers/clocksource/arm_arch_timer.c > @@ -21,6 +21,7 @@ > #include <linux/io.h> > #include <linux/slab.h> > #include <linux/sched_clock.h> > +#include <linux/acpi.h> > > #include <asm/arch_timer.h> > #include <asm/virt.h> > @@ -370,8 +371,12 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) > if (arch_timer_rate) > return; > > - /* Try to determine the frequency from the device tree or CNTFRQ */ > - if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { > + /* > + * Try to determine the frequency from the device tree or CNTFRQ, > + * if ACPI is enabled, get the frequency from CNTFRQ ONLY. > + */ > + if (!acpi_disabled || > + of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { > if (cntbase) > arch_timer_rate = readl_relaxed(cntbase + CNTFRQ); > else > @@ -690,28 +695,8 @@ static void __init arch_timer_common_init(void) > arch_timer_arch_init(); > } > > -static void __init arch_timer_init(struct device_node *np) > +static void __init arch_timer_init(void) > { > - int i; > - > - if (arch_timers_present & ARCH_CP15_TIMER) { > - pr_warn("arch_timer: multiple nodes in dt, skipping\n"); > - return; > - } > - > - arch_timers_present |= ARCH_CP15_TIMER; > - for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) > - arch_timer_ppi[i] = irq_of_parse_and_map(np, i); > - arch_timer_detect_rate(NULL, np); > - > - /* > - * If we cannot rely on firmware initializing the timer registers then > - * we should use the physical timers instead. > - */ > - if (IS_ENABLED(CONFIG_ARM) && > - of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) > - arch_timer_use_virtual = false; > - > /* > * If HYP mode is available, we know that the physical timer > * has been configured to be accessible from PL1. Use it, so > @@ -730,13 +715,39 @@ static void __init arch_timer_init(struct device_node *np) > } > } > > - arch_timer_c3stop = !of_property_read_bool(np, "always-on"); > - > arch_timer_register(); > arch_timer_common_init(); > } > -CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_init); > -CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_init); > + > +static void __init arch_timer_of_init(struct device_node *np) > +{ > + int i; > + > + if (arch_timers_present & ARCH_CP15_TIMER) { > + pr_warn("arch_timer: multiple nodes in dt, skipping\n"); > + return; > + } > + > + arch_timers_present |= ARCH_CP15_TIMER; > + for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) > + arch_timer_ppi[i] = irq_of_parse_and_map(np, i); > + > + arch_timer_detect_rate(NULL, np); > + > + arch_timer_c3stop = !of_property_read_bool(np, "always-on"); > + > + /* > + * If we cannot rely on firmware initializing the timer registers then > + * we should use the physical timers instead. > + */ > + if (IS_ENABLED(CONFIG_ARM) && > + of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) > + arch_timer_use_virtual = false; > + > + arch_timer_init(); > +} > +CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init); > +CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_of_init); > > static void __init arch_timer_mem_init(struct device_node *np) > { > @@ -803,3 +814,70 @@ static void __init arch_timer_mem_init(struct device_node *np) > } > CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", > arch_timer_mem_init); > + > +#ifdef CONFIG_ACPI > +static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) > +{ > + int trigger, polarity; > + > + if (!interrupt) > + return 0; > + > + trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE > + : ACPI_LEVEL_SENSITIVE; > + > + polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW > + : ACPI_ACTIVE_HIGH; > + > + return acpi_register_gsi(NULL, interrupt, trigger, polarity); > +} > + > +/* Initialize per-processor generic timer */ > +static int __init arch_timer_acpi_init(struct acpi_table_header *table) > +{ > + struct acpi_table_gtdt *gtdt; > + > + if (arch_timers_present & ARCH_CP15_TIMER) { > + pr_warn("arch_timer: already initialized, skipping\n"); > + return -EINVAL; > + } > + > + gtdt = container_of(table, struct acpi_table_gtdt, header); > + > + arch_timers_present |= ARCH_CP15_TIMER; > + > + arch_timer_ppi[PHYS_SECURE_PPI] = > + map_generic_timer_interrupt(gtdt->secure_el1_interrupt, > + gtdt->secure_el1_flags); > + > + arch_timer_ppi[PHYS_NONSECURE_PPI] = > + map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, > + gtdt->non_secure_el1_flags); > + > + arch_timer_ppi[VIRT_PPI] = > + map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, > + gtdt->virtual_timer_flags); > + > + arch_timer_ppi[HYP_PPI] = > + map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, > + gtdt->non_secure_el2_flags); > + > + /* Get the frequency from CNTFRQ */ > + arch_timer_detect_rate(NULL, NULL); > + > + /* Always-on capability */ > + arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); > + > + arch_timer_init(); > + return 0; > +} > + > +/* Initialize all the generic timers presented in GTDT */ > +void __init acpi_generic_timer_init(void) > +{ > + if (acpi_disabled) > + return; > + > + acpi_table_parse(ACPI_SIG_GTDT, arch_timer_acpi_init); > +} > +#endif > diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h > index abcafaa..af6155a 100644 > --- a/include/linux/clocksource.h > +++ b/include/linux/clocksource.h > @@ -346,4 +346,10 @@ extern void clocksource_of_init(void); > static inline void clocksource_of_init(void) {} > #endif > > +#ifdef CONFIG_ACPI > +void acpi_generic_timer_init(void); > +#else > +static inline void acpi_generic_timer_init(void) { } > +#endif > + > #endif /* _LINUX_CLOCKSOURCE_H */ >
On 2015?02?03? 06:23, Rafael J. Wysocki wrote: > On Monday, February 02, 2015 08:45:45 PM Hanjun Guo wrote: >> Using the information presented by GTDT (Generic Timer Description Table) >> to initialize the arch timer (not memory-mapped). >> >> CC: Daniel Lezcano <daniel.lezcano@linaro.org> >> Originally-by: Amit Daniel Kachhap <amit.daniel@samsung.com> >> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> >> Tested-by: Yijing Wang <wangyijing@huawei.com> >> Tested-by: Mark Langsdorf <mlangsdo@redhat.com> >> Tested-by: Jon Masters <jcm@redhat.com> >> Tested-by: Timur Tabi <timur@codeaurora.org> >> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> >> --- >> arch/arm64/kernel/time.c | 7 ++ >> drivers/clocksource/arm_arch_timer.c | 132 ++++++++++++++++++++++++++++------- > > An ACK from Thomas Gleixner is necessary for that. I will CC Thomas in the change log in next version with both patch 16/17. Thanks Hanjun
On Mon, Feb 02, 2015 at 12:45:45PM +0000, Hanjun Guo wrote: > Using the information presented by GTDT (Generic Timer Description Table) > to initialize the arch timer (not memory-mapped). Why are you not initializing the memory mapped timer ? > CC: Daniel Lezcano <daniel.lezcano@linaro.org> > Originally-by: Amit Daniel Kachhap <amit.daniel@samsung.com> > Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> > Tested-by: Yijing Wang <wangyijing@huawei.com> > Tested-by: Mark Langsdorf <mlangsdo@redhat.com> > Tested-by: Jon Masters <jcm@redhat.com> > Tested-by: Timur Tabi <timur@codeaurora.org> > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> > --- > arch/arm64/kernel/time.c | 7 ++ > drivers/clocksource/arm_arch_timer.c | 132 ++++++++++++++++++++++++++++------- > include/linux/clocksource.h | 6 ++ > 3 files changed, 118 insertions(+), 27 deletions(-) > > diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c > index 1a7125c..42f9195 100644 > --- a/arch/arm64/kernel/time.c > +++ b/arch/arm64/kernel/time.c > @@ -35,6 +35,7 @@ > #include <linux/delay.h> > #include <linux/clocksource.h> > #include <linux/clk-provider.h> > +#include <linux/acpi.h> > > #include <clocksource/arm_arch_timer.h> > > @@ -72,6 +73,12 @@ void __init time_init(void) > > tick_setup_hrtimer_broadcast(); > > + /* > + * Since ACPI or FDT will only one be available in the system, > + * we can use acpi_generic_timer_init() here safely > + */ > + acpi_generic_timer_init(); > + > arch_timer_rate = arch_timer_get_rate(); > if (!arch_timer_rate) > panic("Unable to initialise architected timer.\n"); > diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c > index 095c177..407aa63 100644 > --- a/drivers/clocksource/arm_arch_timer.c > +++ b/drivers/clocksource/arm_arch_timer.c > @@ -21,6 +21,7 @@ > #include <linux/io.h> > #include <linux/slab.h> > #include <linux/sched_clock.h> > +#include <linux/acpi.h> > > #include <asm/arch_timer.h> > #include <asm/virt.h> > @@ -370,8 +371,12 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) > if (arch_timer_rate) > return; > > - /* Try to determine the frequency from the device tree or CNTFRQ */ > - if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { > + /* > + * Try to determine the frequency from the device tree or CNTFRQ, > + * if ACPI is enabled, get the frequency from CNTFRQ ONLY. > + */ > + if (!acpi_disabled || > + of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { This is getting a mess. cntbase tells you it is a memory mapped timer, node pointer that you are probing through DT, and to top it all acpi_disabled detects if you are probing in ACPI or DT mode. I think this function should be simplified, this driver is also pending a refactoring to split arch timer and the memory mapped one so I think you'd better wait that work to make things simpler. [...] > +/* Initialize all the generic timers presented in GTDT */ > +void __init acpi_generic_timer_init(void) > +{ > + if (acpi_disabled) > + return; acpi_disabled used again here, I repeat myself this is going to be hard to track. You should try to organize the code something like: if (acpi_disabled) timer_dt_probe(); else timer_acpi_probe(); mixing the code paths is getting unwieldy, see above to see my reasoning. > + > + acpi_table_parse(ACPI_SIG_GTDT, arch_timer_acpi_init); > +} > +#endif > diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h > index abcafaa..af6155a 100644 > --- a/include/linux/clocksource.h > +++ b/include/linux/clocksource.h > @@ -346,4 +346,10 @@ extern void clocksource_of_init(void); > static inline void clocksource_of_init(void) {} > #endif > > +#ifdef CONFIG_ACPI > +void acpi_generic_timer_init(void); > +#else > +static inline void acpi_generic_timer_init(void) { } > +#endif > + That's not nice, it is a generic header, arch specific stuff should be avoided. I think you should have an ACPI generic layer similar to clocksource_of_init(), and probe from there when matching the respective timers. Lorenzo
Hi Lorenzo, On 2015?02?05? 02:59, Lorenzo Pieralisi wrote: > On Mon, Feb 02, 2015 at 12:45:45PM +0000, Hanjun Guo wrote: >> Using the information presented by GTDT (Generic Timer Description Table) >> to initialize the arch timer (not memory-mapped). > > Why are you not initializing the memory mapped timer ? We left it for later work because no need for that to boot available ARM64 hardware at now, and we have no hardware to test unless I missed some of platforms. > >> CC: Daniel Lezcano <daniel.lezcano@linaro.org> >> Originally-by: Amit Daniel Kachhap <amit.daniel@samsung.com> >> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> >> Tested-by: Yijing Wang <wangyijing@huawei.com> >> Tested-by: Mark Langsdorf <mlangsdo@redhat.com> >> Tested-by: Jon Masters <jcm@redhat.com> >> Tested-by: Timur Tabi <timur@codeaurora.org> >> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> >> --- >> arch/arm64/kernel/time.c | 7 ++ >> drivers/clocksource/arm_arch_timer.c | 132 ++++++++++++++++++++++++++++------- >> include/linux/clocksource.h | 6 ++ >> 3 files changed, 118 insertions(+), 27 deletions(-) >> >> diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c >> index 1a7125c..42f9195 100644 >> --- a/arch/arm64/kernel/time.c >> +++ b/arch/arm64/kernel/time.c >> @@ -35,6 +35,7 @@ >> #include <linux/delay.h> >> #include <linux/clocksource.h> >> #include <linux/clk-provider.h> >> +#include <linux/acpi.h> >> >> #include <clocksource/arm_arch_timer.h> >> >> @@ -72,6 +73,12 @@ void __init time_init(void) >> >> tick_setup_hrtimer_broadcast(); >> >> + /* >> + * Since ACPI or FDT will only one be available in the system, >> + * we can use acpi_generic_timer_init() here safely >> + */ >> + acpi_generic_timer_init(); >> + >> arch_timer_rate = arch_timer_get_rate(); >> if (!arch_timer_rate) >> panic("Unable to initialise architected timer.\n"); >> diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c >> index 095c177..407aa63 100644 >> --- a/drivers/clocksource/arm_arch_timer.c >> +++ b/drivers/clocksource/arm_arch_timer.c >> @@ -21,6 +21,7 @@ >> #include <linux/io.h> >> #include <linux/slab.h> >> #include <linux/sched_clock.h> >> +#include <linux/acpi.h> >> >> #include <asm/arch_timer.h> >> #include <asm/virt.h> >> @@ -370,8 +371,12 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) >> if (arch_timer_rate) >> return; >> >> - /* Try to determine the frequency from the device tree or CNTFRQ */ >> - if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { >> + /* >> + * Try to determine the frequency from the device tree or CNTFRQ, >> + * if ACPI is enabled, get the frequency from CNTFRQ ONLY. >> + */ >> + if (!acpi_disabled || >> + of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { > > This is getting a mess. cntbase tells you it is a memory mapped timer, > node pointer that you are probing through DT, and to top it all > acpi_disabled detects if you are probing in ACPI or DT mode. > > I think this function should be simplified, this driver is also > pending a refactoring to split arch timer and the memory mapped one > so I think you'd better wait that work to make things simpler. Does anyone working on this now? > > [...] > >> +/* Initialize all the generic timers presented in GTDT */ >> +void __init acpi_generic_timer_init(void) >> +{ >> + if (acpi_disabled) >> + return; > > acpi_disabled used again here, I repeat myself this is going to be > hard to track. You should try to organize the code something like: > > if (acpi_disabled) > timer_dt_probe(); > else > timer_acpi_probe(); > > mixing the code paths is getting unwieldy, see above to see my > reasoning. Olof is unhappy with such approach, I think if (acpi_disabled) is self-contained because we only get DT or ACPI in the system, we can call this function time_init() without more if (acpi_disabled). > >> + >> + acpi_table_parse(ACPI_SIG_GTDT, arch_timer_acpi_init); >> +} >> +#endif >> diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h >> index abcafaa..af6155a 100644 >> --- a/include/linux/clocksource.h >> +++ b/include/linux/clocksource.h >> @@ -346,4 +346,10 @@ extern void clocksource_of_init(void); >> static inline void clocksource_of_init(void) {} >> #endif >> >> +#ifdef CONFIG_ACPI >> +void acpi_generic_timer_init(void); >> +#else >> +static inline void acpi_generic_timer_init(void) { } >> +#endif >> + > > That's not nice, it is a generic header, arch specific stuff should be > avoided. I think you should have an ACPI generic layer similar to > clocksource_of_init(), and probe from there when matching the respective > timers. I think I'm OK with it, but do we really need to introduce a heavy framework to init just arm arch timer (memory mapped or not) ? Thanks Hanjun
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c index 1a7125c..42f9195 100644 --- a/arch/arm64/kernel/time.c +++ b/arch/arm64/kernel/time.c @@ -35,6 +35,7 @@ #include <linux/delay.h> #include <linux/clocksource.h> #include <linux/clk-provider.h> +#include <linux/acpi.h> #include <clocksource/arm_arch_timer.h> @@ -72,6 +73,12 @@ void __init time_init(void) tick_setup_hrtimer_broadcast(); + /* + * Since ACPI or FDT will only one be available in the system, + * we can use acpi_generic_timer_init() here safely + */ + acpi_generic_timer_init(); + arch_timer_rate = arch_timer_get_rate(); if (!arch_timer_rate) panic("Unable to initialise architected timer.\n"); diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 095c177..407aa63 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -21,6 +21,7 @@ #include <linux/io.h> #include <linux/slab.h> #include <linux/sched_clock.h> +#include <linux/acpi.h> #include <asm/arch_timer.h> #include <asm/virt.h> @@ -370,8 +371,12 @@ arch_timer_detect_rate(void __iomem *cntbase, struct device_node *np) if (arch_timer_rate) return; - /* Try to determine the frequency from the device tree or CNTFRQ */ - if (of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { + /* + * Try to determine the frequency from the device tree or CNTFRQ, + * if ACPI is enabled, get the frequency from CNTFRQ ONLY. + */ + if (!acpi_disabled || + of_property_read_u32(np, "clock-frequency", &arch_timer_rate)) { if (cntbase) arch_timer_rate = readl_relaxed(cntbase + CNTFRQ); else @@ -690,28 +695,8 @@ static void __init arch_timer_common_init(void) arch_timer_arch_init(); } -static void __init arch_timer_init(struct device_node *np) +static void __init arch_timer_init(void) { - int i; - - if (arch_timers_present & ARCH_CP15_TIMER) { - pr_warn("arch_timer: multiple nodes in dt, skipping\n"); - return; - } - - arch_timers_present |= ARCH_CP15_TIMER; - for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) - arch_timer_ppi[i] = irq_of_parse_and_map(np, i); - arch_timer_detect_rate(NULL, np); - - /* - * If we cannot rely on firmware initializing the timer registers then - * we should use the physical timers instead. - */ - if (IS_ENABLED(CONFIG_ARM) && - of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) - arch_timer_use_virtual = false; - /* * If HYP mode is available, we know that the physical timer * has been configured to be accessible from PL1. Use it, so @@ -730,13 +715,39 @@ static void __init arch_timer_init(struct device_node *np) } } - arch_timer_c3stop = !of_property_read_bool(np, "always-on"); - arch_timer_register(); arch_timer_common_init(); } -CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_init); -CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_init); + +static void __init arch_timer_of_init(struct device_node *np) +{ + int i; + + if (arch_timers_present & ARCH_CP15_TIMER) { + pr_warn("arch_timer: multiple nodes in dt, skipping\n"); + return; + } + + arch_timers_present |= ARCH_CP15_TIMER; + for (i = PHYS_SECURE_PPI; i < MAX_TIMER_PPI; i++) + arch_timer_ppi[i] = irq_of_parse_and_map(np, i); + + arch_timer_detect_rate(NULL, np); + + arch_timer_c3stop = !of_property_read_bool(np, "always-on"); + + /* + * If we cannot rely on firmware initializing the timer registers then + * we should use the physical timers instead. + */ + if (IS_ENABLED(CONFIG_ARM) && + of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) + arch_timer_use_virtual = false; + + arch_timer_init(); +} +CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_of_init); +CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_of_init); static void __init arch_timer_mem_init(struct device_node *np) { @@ -803,3 +814,70 @@ static void __init arch_timer_mem_init(struct device_node *np) } CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem", arch_timer_mem_init); + +#ifdef CONFIG_ACPI +static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) +{ + int trigger, polarity; + + if (!interrupt) + return 0; + + trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE + : ACPI_LEVEL_SENSITIVE; + + polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW + : ACPI_ACTIVE_HIGH; + + return acpi_register_gsi(NULL, interrupt, trigger, polarity); +} + +/* Initialize per-processor generic timer */ +static int __init arch_timer_acpi_init(struct acpi_table_header *table) +{ + struct acpi_table_gtdt *gtdt; + + if (arch_timers_present & ARCH_CP15_TIMER) { + pr_warn("arch_timer: already initialized, skipping\n"); + return -EINVAL; + } + + gtdt = container_of(table, struct acpi_table_gtdt, header); + + arch_timers_present |= ARCH_CP15_TIMER; + + arch_timer_ppi[PHYS_SECURE_PPI] = + map_generic_timer_interrupt(gtdt->secure_el1_interrupt, + gtdt->secure_el1_flags); + + arch_timer_ppi[PHYS_NONSECURE_PPI] = + map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, + gtdt->non_secure_el1_flags); + + arch_timer_ppi[VIRT_PPI] = + map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, + gtdt->virtual_timer_flags); + + arch_timer_ppi[HYP_PPI] = + map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, + gtdt->non_secure_el2_flags); + + /* Get the frequency from CNTFRQ */ + arch_timer_detect_rate(NULL, NULL); + + /* Always-on capability */ + arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); + + arch_timer_init(); + return 0; +} + +/* Initialize all the generic timers presented in GTDT */ +void __init acpi_generic_timer_init(void) +{ + if (acpi_disabled) + return; + + acpi_table_parse(ACPI_SIG_GTDT, arch_timer_acpi_init); +} +#endif diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index abcafaa..af6155a 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -346,4 +346,10 @@ extern void clocksource_of_init(void); static inline void clocksource_of_init(void) {} #endif +#ifdef CONFIG_ACPI +void acpi_generic_timer_init(void); +#else +static inline void acpi_generic_timer_init(void) { } +#endif + #endif /* _LINUX_CLOCKSOURCE_H */