| Message ID | 1469460427-8643-6-git-send-email-fu.wei@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Monday, July 25, 2016 11:27:03 PM fu.wei@linaro.org wrote: > From: Fu Wei <fu.wei@linaro.org> > > This patch adds support for parsing arch timer in GTDT, > provides some kernel APIs to parse all the PPIs and > always-on info in GTDT and export them. > > By this driver, we can simplify arm_arch_timer drivers, and > separate the ACPI GTDT knowledge from it. > > Signed-off-by: Fu Wei <fu.wei@linaro.org> > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> From the ACPI perspective: Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> and I'm assuming that the patches will go in via some other (non-ACPI) tree. > --- > arch/arm64/Kconfig | 1 + > drivers/acpi/Kconfig | 5 ++ > drivers/acpi/Makefile | 1 + > drivers/acpi/arm64/Kconfig | 5 ++ > drivers/acpi/arm64/Makefile | 1 + > drivers/acpi/arm64/acpi_gtdt.c | 152 +++++++++++++++++++++++++++++++++++++++++ > drivers/clocksource/Kconfig | 1 - > include/linux/acpi.h | 6 ++ > 8 files changed, 171 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 5a0a691..0b9fba7 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2,6 +2,7 @@ config ARM64 > def_bool y > select ACPI_CCA_REQUIRED if ACPI > select ACPI_GENERIC_GSI if ACPI > + select ACPI_GTDT if ACPI > select ACPI_REDUCED_HARDWARE_ONLY if ACPI > select ARCH_HAS_DEVMEM_IS_ALLOWED > select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > index b7e2e77..1cdc7d2 100644 > --- a/drivers/acpi/Kconfig > +++ b/drivers/acpi/Kconfig > @@ -521,4 +521,9 @@ config XPOWER_PMIC_OPREGION > > endif > > +if ARM64 > +source "drivers/acpi/arm64/Kconfig" > + > +endif > + > endif # ACPI > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index 251ce85..1a94ff7 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -99,5 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o > obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o > obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o > obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o > +obj-$(CONFIG_ARM64) += arm64/ > > video-objs += acpi_video.o video_detect.o > diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig > new file mode 100644 > index 0000000..80201be > --- /dev/null > +++ b/drivers/acpi/arm64/Kconfig > @@ -0,0 +1,5 @@ > +# > +# ACPI Configuration for ARM64 > +# > +config ACPI_GTDT > + bool > diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile > new file mode 100644 > index 0000000..466de6b > --- /dev/null > +++ b/drivers/acpi/arm64/Makefile > @@ -0,0 +1 @@ > +obj-$(CONFIG_ACPI_GTDT) += acpi_gtdt.o > diff --git a/drivers/acpi/arm64/acpi_gtdt.c b/drivers/acpi/arm64/acpi_gtdt.c > new file mode 100644 > index 0000000..cdb2fb1 > --- /dev/null > +++ b/drivers/acpi/arm64/acpi_gtdt.c > @@ -0,0 +1,152 @@ > +/* > + * ARM Specific GTDT table Support > + * > + * Copyright (C) 2016, Linaro Ltd. > + * Author: Daniel Lezcano <daniel.lezcano@linaro.org> > + * Fu Wei <fu.wei@linaro.org> > + * Hanjun Guo <hanjun.guo@linaro.org> > + * > + * 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. > + */ > + > +#include <linux/acpi.h> > +#include <linux/init.h> > +#include <linux/kernel.h> > + > +#include <clocksource/arm_arch_timer.h> > + > +#undef pr_fmt > +#define pr_fmt(fmt) "ACPI GTDT: " fmt > + > +typedef struct { > + struct acpi_table_gtdt *gtdt; > + void *platform_timer_start; > + void *gtdt_end; > +} acpi_gtdt_desc_t; > + > +static acpi_gtdt_desc_t acpi_gtdt_desc __initdata; > + > +static inline void *next_platform_timer(void *platform_timer) > +{ > + struct acpi_gtdt_header *gh = platform_timer; > + > + platform_timer += gh->length; > + if (platform_timer < acpi_gtdt_desc.gtdt_end) > + return platform_timer; > + > + return NULL; > +} > + > +#define for_each_platform_timer(_g) \ > + for (_g = acpi_gtdt_desc.platform_timer_start; _g; \ > + _g = next_platform_timer(_g)) > + > +static inline bool is_timer_block(void *platform_timer) > +{ > + struct acpi_gtdt_header *gh = platform_timer; > + > + return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK; > +} > + > +static inline bool is_watchdog(void *platform_timer) > +{ > + struct acpi_gtdt_header *gh = platform_timer; > + > + return gh->type == ACPI_GTDT_TYPE_WATCHDOG; > +} > + > +static int __init map_gt_gsi(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); > +} > + > +/* > + * Map the PPIs of per-cpu arch_timer. > + * @type: the type of PPI > + * Returns 0 if error. > + */ > +int __init acpi_gtdt_map_ppi(int type) > +{ > + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; > + > + switch (type) { > + case PHYS_SECURE_PPI: > + return map_gt_gsi(gtdt->secure_el1_interrupt, > + gtdt->secure_el1_flags); > + case PHYS_NONSECURE_PPI: > + return map_gt_gsi(gtdt->non_secure_el1_interrupt, > + gtdt->non_secure_el1_flags); > + case VIRT_PPI: > + return map_gt_gsi(gtdt->virtual_timer_interrupt, > + gtdt->virtual_timer_flags); > + > + case HYP_PPI: > + return map_gt_gsi(gtdt->non_secure_el2_interrupt, > + gtdt->non_secure_el2_flags); > + default: > + pr_err("Failed to map timer interrupt: invalid type.\n"); > + } > + > + return 0; > +} > + > +/* > + * acpi_gtdt_c3stop - got c3stop info from GTDT > + * > + * Returns 1 if the timer is powered in deep idle state, 0 otherwise. > + */ > +bool __init acpi_gtdt_c3stop(void) > +{ > + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; > + > + return !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); > +} > + > +/* > + * Get some basic info from GTDT table, and init the global variables above > + * for all timers initialization of Generic Timer. > + * This function does some validation on GTDT table. > + */ > +int __init acpi_gtdt_init(struct acpi_table_header *table) > +{ > + void *start; > + struct acpi_table_gtdt *gtdt; > + > + gtdt = container_of(table, struct acpi_table_gtdt, header); > + > + acpi_gtdt_desc.gtdt = gtdt; > + acpi_gtdt_desc.gtdt_end = (void *)table + table->length; > + > + if (table->revision < 2) { > + pr_debug("Revision:%d doesn't support Platform Timers.\n", > + table->revision); > + return 0; > + } > + > + if (!gtdt->platform_timer_count) { > + pr_debug("No Platform Timer.\n"); > + return 0; > + } > + > + start = (void *)gtdt + gtdt->platform_timer_offset; > + if (start < (void *)table + sizeof(struct acpi_table_gtdt)) { > + pr_err(FW_BUG "Failed to retrieve timer info from firmware: invalid data.\n"); > + return -EINVAL; > + } > + acpi_gtdt_desc.platform_timer_start = start; > + > + return gtdt->platform_timer_count; > +} > diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig > index 47352d2..108dbc3 100644 > --- a/drivers/clocksource/Kconfig > +++ b/drivers/clocksource/Kconfig > @@ -205,7 +205,6 @@ config CLKSRC_MPS2 > config ARM_ARCH_TIMER > bool > select CLKSRC_OF if OF > - select CLKSRC_ACPI if ACPI > > config ARM_ARCH_TIMER_EVTSTREAM > bool "Support for ARM architected timer event stream generation" > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 288fac5..fb8b689 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -532,6 +532,12 @@ void acpi_walk_dep_device_list(acpi_handle handle); > struct platform_device *acpi_create_platform_device(struct acpi_device *); > #define ACPI_PTR(_ptr) (_ptr) > > +#ifdef CONFIG_ACPI_GTDT > +int acpi_gtdt_init(struct acpi_table_header *table); > +int acpi_gtdt_map_ppi(int type); > +bool acpi_gtdt_c3stop(void); > +#endif > + > #else /* !CONFIG_ACPI */ > > #define acpi_disabled 1 >
Hi Rafael, On 26 July 2016 at 19:50, Rafael J. Wysocki <rjw@rjwysocki.net> wrote: > On Monday, July 25, 2016 11:27:03 PM fu.wei@linaro.org wrote: >> From: Fu Wei <fu.wei@linaro.org> >> >> This patch adds support for parsing arch timer in GTDT, >> provides some kernel APIs to parse all the PPIs and >> always-on info in GTDT and export them. >> >> By this driver, we can simplify arm_arch_timer drivers, and >> separate the ACPI GTDT knowledge from it. >> >> Signed-off-by: Fu Wei <fu.wei@linaro.org> >> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> > > From the ACPI perspective: > > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Great thanks for your help, I just posted v10, then got your ACK :-) But there is not change in the patch, I 'm assuming that your ACK still works for my v10 :-) > > and I'm assuming that the patches will go in via some other (non-ACPI) tree. I think so, I guess the clocksource maintainer will take care of it. Daniel, is this patch will go into clocksource tree? Thanks for your help! :-) > >> --- >> arch/arm64/Kconfig | 1 + >> drivers/acpi/Kconfig | 5 ++ >> drivers/acpi/Makefile | 1 + >> drivers/acpi/arm64/Kconfig | 5 ++ >> drivers/acpi/arm64/Makefile | 1 + >> drivers/acpi/arm64/acpi_gtdt.c | 152 +++++++++++++++++++++++++++++++++++++++++ >> drivers/clocksource/Kconfig | 1 - >> include/linux/acpi.h | 6 ++ >> 8 files changed, 171 insertions(+), 1 deletion(-) >> >> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig >> index 5a0a691..0b9fba7 100644 >> --- a/arch/arm64/Kconfig >> +++ b/arch/arm64/Kconfig >> @@ -2,6 +2,7 @@ config ARM64 >> def_bool y >> select ACPI_CCA_REQUIRED if ACPI >> select ACPI_GENERIC_GSI if ACPI >> + select ACPI_GTDT if ACPI >> select ACPI_REDUCED_HARDWARE_ONLY if ACPI >> select ARCH_HAS_DEVMEM_IS_ALLOWED >> select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE >> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig >> index b7e2e77..1cdc7d2 100644 >> --- a/drivers/acpi/Kconfig >> +++ b/drivers/acpi/Kconfig >> @@ -521,4 +521,9 @@ config XPOWER_PMIC_OPREGION >> >> endif >> >> +if ARM64 >> +source "drivers/acpi/arm64/Kconfig" >> + >> +endif >> + >> endif # ACPI >> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile >> index 251ce85..1a94ff7 100644 >> --- a/drivers/acpi/Makefile >> +++ b/drivers/acpi/Makefile >> @@ -99,5 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o >> obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o >> obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o >> obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o >> +obj-$(CONFIG_ARM64) += arm64/ >> >> video-objs += acpi_video.o video_detect.o >> diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig >> new file mode 100644 >> index 0000000..80201be >> --- /dev/null >> +++ b/drivers/acpi/arm64/Kconfig >> @@ -0,0 +1,5 @@ >> +# >> +# ACPI Configuration for ARM64 >> +# >> +config ACPI_GTDT >> + bool >> diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile >> new file mode 100644 >> index 0000000..466de6b >> --- /dev/null >> +++ b/drivers/acpi/arm64/Makefile >> @@ -0,0 +1 @@ >> +obj-$(CONFIG_ACPI_GTDT) += acpi_gtdt.o >> diff --git a/drivers/acpi/arm64/acpi_gtdt.c b/drivers/acpi/arm64/acpi_gtdt.c >> new file mode 100644 >> index 0000000..cdb2fb1 >> --- /dev/null >> +++ b/drivers/acpi/arm64/acpi_gtdt.c >> @@ -0,0 +1,152 @@ >> +/* >> + * ARM Specific GTDT table Support >> + * >> + * Copyright (C) 2016, Linaro Ltd. >> + * Author: Daniel Lezcano <daniel.lezcano@linaro.org> >> + * Fu Wei <fu.wei@linaro.org> >> + * Hanjun Guo <hanjun.guo@linaro.org> >> + * >> + * 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. >> + */ >> + >> +#include <linux/acpi.h> >> +#include <linux/init.h> >> +#include <linux/kernel.h> >> + >> +#include <clocksource/arm_arch_timer.h> >> + >> +#undef pr_fmt >> +#define pr_fmt(fmt) "ACPI GTDT: " fmt >> + >> +typedef struct { >> + struct acpi_table_gtdt *gtdt; >> + void *platform_timer_start; >> + void *gtdt_end; >> +} acpi_gtdt_desc_t; >> + >> +static acpi_gtdt_desc_t acpi_gtdt_desc __initdata; >> + >> +static inline void *next_platform_timer(void *platform_timer) >> +{ >> + struct acpi_gtdt_header *gh = platform_timer; >> + >> + platform_timer += gh->length; >> + if (platform_timer < acpi_gtdt_desc.gtdt_end) >> + return platform_timer; >> + >> + return NULL; >> +} >> + >> +#define for_each_platform_timer(_g) \ >> + for (_g = acpi_gtdt_desc.platform_timer_start; _g; \ >> + _g = next_platform_timer(_g)) >> + >> +static inline bool is_timer_block(void *platform_timer) >> +{ >> + struct acpi_gtdt_header *gh = platform_timer; >> + >> + return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK; >> +} >> + >> +static inline bool is_watchdog(void *platform_timer) >> +{ >> + struct acpi_gtdt_header *gh = platform_timer; >> + >> + return gh->type == ACPI_GTDT_TYPE_WATCHDOG; >> +} >> + >> +static int __init map_gt_gsi(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); >> +} >> + >> +/* >> + * Map the PPIs of per-cpu arch_timer. >> + * @type: the type of PPI >> + * Returns 0 if error. >> + */ >> +int __init acpi_gtdt_map_ppi(int type) >> +{ >> + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; >> + >> + switch (type) { >> + case PHYS_SECURE_PPI: >> + return map_gt_gsi(gtdt->secure_el1_interrupt, >> + gtdt->secure_el1_flags); >> + case PHYS_NONSECURE_PPI: >> + return map_gt_gsi(gtdt->non_secure_el1_interrupt, >> + gtdt->non_secure_el1_flags); >> + case VIRT_PPI: >> + return map_gt_gsi(gtdt->virtual_timer_interrupt, >> + gtdt->virtual_timer_flags); >> + >> + case HYP_PPI: >> + return map_gt_gsi(gtdt->non_secure_el2_interrupt, >> + gtdt->non_secure_el2_flags); >> + default: >> + pr_err("Failed to map timer interrupt: invalid type.\n"); >> + } >> + >> + return 0; >> +} >> + >> +/* >> + * acpi_gtdt_c3stop - got c3stop info from GTDT >> + * >> + * Returns 1 if the timer is powered in deep idle state, 0 otherwise. >> + */ >> +bool __init acpi_gtdt_c3stop(void) >> +{ >> + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; >> + >> + return !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); >> +} >> + >> +/* >> + * Get some basic info from GTDT table, and init the global variables above >> + * for all timers initialization of Generic Timer. >> + * This function does some validation on GTDT table. >> + */ >> +int __init acpi_gtdt_init(struct acpi_table_header *table) >> +{ >> + void *start; >> + struct acpi_table_gtdt *gtdt; >> + >> + gtdt = container_of(table, struct acpi_table_gtdt, header); >> + >> + acpi_gtdt_desc.gtdt = gtdt; >> + acpi_gtdt_desc.gtdt_end = (void *)table + table->length; >> + >> + if (table->revision < 2) { >> + pr_debug("Revision:%d doesn't support Platform Timers.\n", >> + table->revision); >> + return 0; >> + } >> + >> + if (!gtdt->platform_timer_count) { >> + pr_debug("No Platform Timer.\n"); >> + return 0; >> + } >> + >> + start = (void *)gtdt + gtdt->platform_timer_offset; >> + if (start < (void *)table + sizeof(struct acpi_table_gtdt)) { >> + pr_err(FW_BUG "Failed to retrieve timer info from firmware: invalid data.\n"); >> + return -EINVAL; >> + } >> + acpi_gtdt_desc.platform_timer_start = start; >> + >> + return gtdt->platform_timer_count; >> +} >> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig >> index 47352d2..108dbc3 100644 >> --- a/drivers/clocksource/Kconfig >> +++ b/drivers/clocksource/Kconfig >> @@ -205,7 +205,6 @@ config CLKSRC_MPS2 >> config ARM_ARCH_TIMER >> bool >> select CLKSRC_OF if OF >> - select CLKSRC_ACPI if ACPI >> >> config ARM_ARCH_TIMER_EVTSTREAM >> bool "Support for ARM architected timer event stream generation" >> diff --git a/include/linux/acpi.h b/include/linux/acpi.h >> index 288fac5..fb8b689 100644 >> --- a/include/linux/acpi.h >> +++ b/include/linux/acpi.h >> @@ -532,6 +532,12 @@ void acpi_walk_dep_device_list(acpi_handle handle); >> struct platform_device *acpi_create_platform_device(struct acpi_device *); >> #define ACPI_PTR(_ptr) (_ptr) >> >> +#ifdef CONFIG_ACPI_GTDT >> +int acpi_gtdt_init(struct acpi_table_header *table); >> +int acpi_gtdt_map_ppi(int type); >> +bool acpi_gtdt_c3stop(void); >> +#endif >> + >> #else /* !CONFIG_ACPI */ >> >> #define acpi_disabled 1 >> >
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 5a0a691..0b9fba7 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2,6 +2,7 @@ config ARM64 def_bool y select ACPI_CCA_REQUIRED if ACPI select ACPI_GENERIC_GSI if ACPI + select ACPI_GTDT if ACPI select ACPI_REDUCED_HARDWARE_ONLY if ACPI select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index b7e2e77..1cdc7d2 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -521,4 +521,9 @@ config XPOWER_PMIC_OPREGION endif +if ARM64 +source "drivers/acpi/arm64/Kconfig" + +endif + endif # ACPI diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 251ce85..1a94ff7 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -99,5 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o +obj-$(CONFIG_ARM64) += arm64/ video-objs += acpi_video.o video_detect.o diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig new file mode 100644 index 0000000..80201be --- /dev/null +++ b/drivers/acpi/arm64/Kconfig @@ -0,0 +1,5 @@ +# +# ACPI Configuration for ARM64 +# +config ACPI_GTDT + bool diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile new file mode 100644 index 0000000..466de6b --- /dev/null +++ b/drivers/acpi/arm64/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_ACPI_GTDT) += acpi_gtdt.o diff --git a/drivers/acpi/arm64/acpi_gtdt.c b/drivers/acpi/arm64/acpi_gtdt.c new file mode 100644 index 0000000..cdb2fb1 --- /dev/null +++ b/drivers/acpi/arm64/acpi_gtdt.c @@ -0,0 +1,152 @@ +/* + * ARM Specific GTDT table Support + * + * Copyright (C) 2016, Linaro Ltd. + * Author: Daniel Lezcano <daniel.lezcano@linaro.org> + * Fu Wei <fu.wei@linaro.org> + * Hanjun Guo <hanjun.guo@linaro.org> + * + * 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. + */ + +#include <linux/acpi.h> +#include <linux/init.h> +#include <linux/kernel.h> + +#include <clocksource/arm_arch_timer.h> + +#undef pr_fmt +#define pr_fmt(fmt) "ACPI GTDT: " fmt + +typedef struct { + struct acpi_table_gtdt *gtdt; + void *platform_timer_start; + void *gtdt_end; +} acpi_gtdt_desc_t; + +static acpi_gtdt_desc_t acpi_gtdt_desc __initdata; + +static inline void *next_platform_timer(void *platform_timer) +{ + struct acpi_gtdt_header *gh = platform_timer; + + platform_timer += gh->length; + if (platform_timer < acpi_gtdt_desc.gtdt_end) + return platform_timer; + + return NULL; +} + +#define for_each_platform_timer(_g) \ + for (_g = acpi_gtdt_desc.platform_timer_start; _g; \ + _g = next_platform_timer(_g)) + +static inline bool is_timer_block(void *platform_timer) +{ + struct acpi_gtdt_header *gh = platform_timer; + + return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK; +} + +static inline bool is_watchdog(void *platform_timer) +{ + struct acpi_gtdt_header *gh = platform_timer; + + return gh->type == ACPI_GTDT_TYPE_WATCHDOG; +} + +static int __init map_gt_gsi(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); +} + +/* + * Map the PPIs of per-cpu arch_timer. + * @type: the type of PPI + * Returns 0 if error. + */ +int __init acpi_gtdt_map_ppi(int type) +{ + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; + + switch (type) { + case PHYS_SECURE_PPI: + return map_gt_gsi(gtdt->secure_el1_interrupt, + gtdt->secure_el1_flags); + case PHYS_NONSECURE_PPI: + return map_gt_gsi(gtdt->non_secure_el1_interrupt, + gtdt->non_secure_el1_flags); + case VIRT_PPI: + return map_gt_gsi(gtdt->virtual_timer_interrupt, + gtdt->virtual_timer_flags); + + case HYP_PPI: + return map_gt_gsi(gtdt->non_secure_el2_interrupt, + gtdt->non_secure_el2_flags); + default: + pr_err("Failed to map timer interrupt: invalid type.\n"); + } + + return 0; +} + +/* + * acpi_gtdt_c3stop - got c3stop info from GTDT + * + * Returns 1 if the timer is powered in deep idle state, 0 otherwise. + */ +bool __init acpi_gtdt_c3stop(void) +{ + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt; + + return !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON); +} + +/* + * Get some basic info from GTDT table, and init the global variables above + * for all timers initialization of Generic Timer. + * This function does some validation on GTDT table. + */ +int __init acpi_gtdt_init(struct acpi_table_header *table) +{ + void *start; + struct acpi_table_gtdt *gtdt; + + gtdt = container_of(table, struct acpi_table_gtdt, header); + + acpi_gtdt_desc.gtdt = gtdt; + acpi_gtdt_desc.gtdt_end = (void *)table + table->length; + + if (table->revision < 2) { + pr_debug("Revision:%d doesn't support Platform Timers.\n", + table->revision); + return 0; + } + + if (!gtdt->platform_timer_count) { + pr_debug("No Platform Timer.\n"); + return 0; + } + + start = (void *)gtdt + gtdt->platform_timer_offset; + if (start < (void *)table + sizeof(struct acpi_table_gtdt)) { + pr_err(FW_BUG "Failed to retrieve timer info from firmware: invalid data.\n"); + return -EINVAL; + } + acpi_gtdt_desc.platform_timer_start = start; + + return gtdt->platform_timer_count; +} diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 47352d2..108dbc3 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -205,7 +205,6 @@ config CLKSRC_MPS2 config ARM_ARCH_TIMER bool select CLKSRC_OF if OF - select CLKSRC_ACPI if ACPI config ARM_ARCH_TIMER_EVTSTREAM bool "Support for ARM architected timer event stream generation" diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 288fac5..fb8b689 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -532,6 +532,12 @@ void acpi_walk_dep_device_list(acpi_handle handle); struct platform_device *acpi_create_platform_device(struct acpi_device *); #define ACPI_PTR(_ptr) (_ptr) +#ifdef CONFIG_ACPI_GTDT +int acpi_gtdt_init(struct acpi_table_header *table); +int acpi_gtdt_map_ppi(int type); +bool acpi_gtdt_c3stop(void); +#endif + #else /* !CONFIG_ACPI */ #define acpi_disabled 1