From: Fu Wei fu.wei@linaro.org
The patch update arm_arch_timer driver to use the function provided by the new GTDT driver of ACPI. By this way, arm_arch_timer.c can be simplified, and separate all the ACPI GTDT knowledge from this timer driver.
Signed-off-by: Fu Wei fu.wei@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- arch/arm64/kernel/time.c | 4 +-- drivers/acpi/gtdt.c | 43 ++++++++++++++++++++++++++ drivers/clocksource/Kconfig | 1 + drivers/clocksource/arm_arch_timer.c | 60 +++++++----------------------------- include/clocksource/arm_arch_timer.h | 8 +++++ include/linux/acpi.h | 5 +++ include/linux/clocksource.h | 4 +-- 7 files changed, 72 insertions(+), 53 deletions(-)
diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c index 42f9195..2cabea6 100644 --- a/arch/arm64/kernel/time.c +++ b/arch/arm64/kernel/time.c @@ -75,9 +75,9 @@ void __init time_init(void)
/* * Since ACPI or FDT will only one be available in the system, - * we can use acpi_generic_timer_init() here safely + * we can use arch_timer_acpi_init() here safely */ - acpi_generic_timer_init(); + arch_timer_acpi_init();
arch_timer_rate = arch_timer_get_rate(); if (!arch_timer_rate) diff --git a/drivers/acpi/gtdt.c b/drivers/acpi/gtdt.c index a92abf2..699c9fd 100644 --- a/drivers/acpi/gtdt.c +++ b/drivers/acpi/gtdt.c @@ -17,6 +17,8 @@ #include <linux/module.h> #include <linux/platform_device.h>
+#include <clocksource/arm_arch_timer.h> + static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) { int trigger, polarity; @@ -33,6 +35,47 @@ static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags) return acpi_register_gsi(NULL, interrupt, trigger, polarity); }
+struct arch_timer_data __initdata *arch_timer_data_p; + +static int __init arch_timer_data_init(struct acpi_table_header *table) +{ + struct acpi_table_gtdt *gtdt; + + gtdt = container_of(table, struct acpi_table_gtdt, header); + + arch_timer_data_p->phys_secure_ppi = + map_generic_timer_interrupt(gtdt->secure_el1_interrupt, + gtdt->secure_el1_flags); + + arch_timer_data_p->phys_nonsecure_ppi = + map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt, + gtdt->non_secure_el1_flags); + + arch_timer_data_p->virt_ppi = + map_generic_timer_interrupt(gtdt->virtual_timer_interrupt, + gtdt->virtual_timer_flags); + + arch_timer_data_p->hyp_ppi = + map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, + gtdt->non_secure_el2_flags); + + arch_timer_data_p->c3stop = !(gtdt->non_secure_el1_flags & + ACPI_GTDT_ALWAYS_ON); + + return 0; +} + +/* Initialize the arch_timer_data struct for arm_arch_timer by GTDT info */ +int __init gtdt_arch_timer_data_init(struct arch_timer_data *data) +{ + if (acpi_disabled || !data) + return -EINVAL; + + arch_timer_data_p = data; + + return acpi_table_parse(ACPI_SIG_GTDT, arch_timer_data_init); +} + /* * Initialize a SBSA generic Watchdog platform device info from GTDT * According to SBSA specification the size of refresh and control diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 51d7865f..ea94a6f 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -109,6 +109,7 @@ config CLKSRC_EFM32 config ARM_ARCH_TIMER bool select CLKSRC_OF if OF + select ACPI_GTDT if ACPI
config ARM_ARCH_TIMER_EVTSTREAM bool "Support for ARM architected timer event stream generation" diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 0aa135d..99505bb 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -817,68 +817,30 @@ 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) +void __init arch_timer_acpi_init(void) { - struct acpi_table_gtdt *gtdt; + struct arch_timer_data data;
if (arch_timers_present & ARCH_CP15_TIMER) { pr_warn("arch_timer: already initialized, skipping\n"); - return -EINVAL; + return; }
- 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); + if (gtdt_arch_timer_data_init(&data)) + return;
- arch_timer_ppi[HYP_PPI] = - map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt, - gtdt->non_secure_el2_flags); + arch_timer_ppi[PHYS_SECURE_PPI] = data.phys_secure_ppi; + arch_timer_ppi[PHYS_NONSECURE_PPI] = data.phys_nonsecure_ppi; + arch_timer_ppi[VIRT_PPI] = data.virt_ppi; + arch_timer_ppi[HYP_PPI] = data.hyp_ppi; + /* Always-on capability */ + arch_timer_c3stop = data.c3stop;
/* 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/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 9916d0e..5deed9d 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -43,6 +43,14 @@ enum arch_timer_reg {
#define ARCH_TIMER_EVT_STREAM_FREQ 10000 /* 100us */
+struct arch_timer_data { + int phys_secure_ppi; + int phys_nonsecure_ppi; + int virt_ppi; + int hyp_ppi; + bool c3stop; +}; + #ifdef CONFIG_ARM_ARCH_TIMER
extern u32 arch_timer_get_rate(void); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 598f0f1..7213c0d 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -458,6 +458,11 @@ 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 +struct arch_timer_data; +int __init gtdt_arch_timer_data_init(struct arch_timer_data *data); +#endif + #else /* !CONFIG_ACPI */
#define acpi_disabled 1 diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h index d27d015..264e553 100644 --- a/include/linux/clocksource.h +++ b/include/linux/clocksource.h @@ -254,9 +254,9 @@ static inline void clocksource_of_init(void) {} #endif
#ifdef CONFIG_ACPI -void acpi_generic_timer_init(void); +void arch_timer_acpi_init(void); #else -static inline void acpi_generic_timer_init(void) { } +static inline void arch_timer_acpi_init(void) { } #endif
#endif /* _LINUX_CLOCKSOURCE_H */