linux-kernel - [PATCH v22 04/11] clocksource: arm_arch_timer: move arch_timer_needs_of

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Message-Id: <20170321163122.9183-5-fu.wei@linaro.org>
Date:   Wed, 22 Mar 2017 00:31:15 +0800
From:   fu.wei@...aro.org
To:     rjw@...ysocki.net, lenb@...nel.org, daniel.lezcano@...aro.org,
        tglx@...utronix.de, marc.zyngier@....com, mark.rutland@....com,
        lorenzo.pieralisi@....com, sudeep.holla@....com,
        hanjun.guo@...aro.org
Cc:     linux-arm-kernel@...ts.infradead.org, linaro-acpi@...ts.linaro.org,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        rruigrok@...eaurora.org, harba@...eaurora.org, cov@...eaurora.org,
        timur@...eaurora.org, graeme.gregory@...aro.org,
        al.stone@...aro.org, jcm@...hat.com, wei@...hat.com, arnd@...db.de,
        catalin.marinas@....com, will.deacon@....com,
        Suravee.Suthikulpanit@....com, leo.duran@....com, wim@...ana.be,
        linux@...ck-us.net, linux-watchdog@...r.kernel.org,
        tn@...ihalf.com, christoffer.dall@...aro.org, julien.grall@....com,
        Fu Wei <fu.wei@...aro.org>
Subject: [PATCH v22 04/11] clocksource: arm_arch_timer: move arch_timer_needs_of_probing into DT init call

From: Fu Wei <fu.wei@...aro.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@...aro.org>
Reviewed-by: Hanjun Guo <hanjun.guo@...aro.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 d1a05d9..4b29a6d 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -868,9 +868,6 @@ 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();
@@ -908,26 +905,9 @@ 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");
@@ -938,6 +918,8 @@ 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];
+
 	/*
 	 * Try to determine the frequency from the device tree,
 	 * if fail, get the frequency from the sysreg CNTFRQ.
@@ -983,7 +965,14 @@ 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);
@@ -1076,7 +1065,8 @@ 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);
@@ -1105,6 +1095,7 @@ 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) {
@@ -1132,6 +1123,8 @@ 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 the sysreg CNTFRQ */
 	arch_timer_rate = arch_timer_get_cntfrq();
 	if (!arch_timer_rate) {
@@ -1148,8 +1141,11 @@ 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