[PATCH v19 08/15] clocksource/drivers/arm_arch_timer: move arch_timer_needs_of_probing into DT init call

fu.wei-QSEj5FYQhm4dnm+yROfE0A
2016-12-21T06:45:56Z

From: Fu Wei <fu.wei-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>

Because arch_timer_needs_of_probing is only for booting with device-tree,
but arch_timer_common_init is a generic init call which shouldn't include
the FW-specific code. It's better to put arch_timer_needs_of_probing into
DT init function.

But for per-cpu timer, the arch_timer_common_init is called from
arch_timer_init. For reaching the goal above, this patch disassemble
arch_timer_init and use arch_timer_register and arch_timer_common_init
directly, just like arch_timer_mem init code is doing.
By this way, all the DT relevant code are only called from DT init call.

Signed-off-by: Fu Wei <fu.wei-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
---
drivers/clocksource/arm_arch_timer.c | 46 ++++++++++++++++--------------------
1 file changed, 21 insertions(+), 25 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 5f7be04..9113df8 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -824,9 +824,6 @@ static bool __init arch_timer_needs_of_probing(void)

static int __init arch_timer_common_init(void)
{
- if (acpi_disabled && arch_timer_needs_of_probing())
- return 0;
-
arch_timer_banner(arch_timers_present);
arch_counter_register(arch_timers_present);
return arch_timer_arch_init();
@@ -864,26 +861,9 @@ static enum arch_timer_ppi_nr __init arch_timer_select_ppi(void)
return ARCH_TIMER_PHYS_SECURE_PPI;
}

-static int __init arch_timer_init(void)
-{
- int ret;
-
- ret = arch_timer_register();
- if (ret)
- return ret;
-
- ret = arch_timer_common_init();
- if (ret)
- return ret;
-
- arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
-
- return 0;
-}
-
static int __init arch_timer_of_init(struct device_node *np)
{
- int i;
+ int i, ret;

if (arch_timers_present & ARCH_TIMER_TYPE_CP15) {
pr_warn("multiple nodes in dt, skipping\n");
@@ -894,6 +874,8 @@ static int __init arch_timer_of_init(struct device_node *np)
for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++)
arch_timer_ppi[i] = irq_of_parse_and_map(np, i);

+ arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
+
if (!arch_timer_rate &&
of_property_read_u32(np, "clock-frequency", &arch_timer_rate))
arch_timer_detect_rate();
@@ -928,7 +910,14 @@ static int __init arch_timer_of_init(struct device_node *np)
arch_counter_suspend_stop = of_property_read_bool(np,
"arm,no-tick-in-suspend");

- return arch_timer_init();
+ ret = arch_timer_register();
+ if (ret)
+ return ret;
+
+ if (arch_timer_needs_of_probing())
+ return 0;
+
+ return arch_timer_common_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);
@@ -1016,7 +1005,8 @@ static int __init arch_timer_mem_init(struct device_node *np)
if (ret)
goto out;

- return arch_timer_common_init();
+ if (!arch_timer_needs_of_probing())
+ ret = arch_timer_common_init();
out:
iounmap(cntctlbase);
of_node_put(best_frame);
@@ -1045,6 +1035,7 @@ static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags)
/* Initialize per-processor generic timer */
static int __init arch_timer_acpi_init(struct acpi_table_header *table)
{
+ int ret;
struct acpi_table_gtdt *gtdt;

if (arch_timers_present & ARCH_TIMER_TYPE_CP15) {
@@ -1072,6 +1063,8 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt,
gtdt->non_secure_el2_flags);

+ arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
+
/* Get the frequency from CNTFRQ */
arch_timer_detect_rate();

@@ -1084,8 +1077,11 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
/* Always-on capability */
arch_timer_c3stop = !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON);

- arch_timer_init();
- return 0;
+ ret = arch_timer_register();
+ if (ret)
+ return ret;
+
+ return arch_timer_common_init();
}
CLOCKSOURCE_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init);
#endif
--
2.9.3

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