From: Fu Wei <fu....@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....@linaro.org>
Signed-off-by: Hanjun Guo <hanjun....@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 */
--
1.9.1
--
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