linux-kernel - [PATCH 13/16] clocksource: arm_arch_timer: simplify ACPI support code.

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Message-Id: <1492620273-30037-14-git-send-email-mark.rutland@arm.com>
Date:   Wed, 19 Apr 2017 17:44:30 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     daniel.lezcano@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        tglx@...utronix.de, fu.wei@...aro.org, lorenzo.pieralisi@....com,
        hanjun.guo@...aro.org, marc.zyngier@....com
Subject: [PATCH 13/16] clocksource: arm_arch_timer: simplify ACPI support code.

From: Fu Wei <fu.wei@...aro.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@...aro.org>
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
Tested-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
Reviewed-by: Hanjun Guo <hanjun.guo@...aro.org>
Tested-by: Hanjun Guo <hanjun.guo@...aro.org>
Signed-off-by: Mark Rutland <mark.rutland@....com>
---
 drivers/clocksource/arm_arch_timer.c | 40 +++++++++---------------------------
 1 file changed, 10 insertions(+), 30 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index d87c403..e398228 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -1385,53 +1385,33 @@ static int __init arch_timer_mem_of_init(struct device_node *np)
 CLOCKSOURCE_OF_DECLARE(armv7_arch_timer_mem, "arm,armv7-timer-mem",
 		       arch_timer_mem_of_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);
-}
-
+#ifdef CONFIG_ACPI_GTDT
 /* 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) {
 		pr_warn("already initialized, skipping\n");
 		return -EINVAL;
 	}
 
-	gtdt = container_of(table, struct acpi_table_gtdt, header);
-
 	arch_timers_present |= ARCH_TIMER_TYPE_CP15;
 
-	arch_timer_ppi[ARCH_TIMER_PHYS_SECURE_PPI] =
-		map_generic_timer_interrupt(gtdt->secure_el1_interrupt,
-		gtdt->secure_el1_flags);
+	ret = acpi_gtdt_init(table, NULL);
+	if (ret) {
+		pr_err("Failed to init GTDT table.\n");
+		return ret;
+	}
 
 	arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI] =
-		map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt,
-		gtdt->non_secure_el1_flags);
+		acpi_gtdt_map_ppi(ARCH_TIMER_PHYS_NONSECURE_PPI);
 
 	arch_timer_ppi[ARCH_TIMER_VIRT_PPI] =
-		map_generic_timer_interrupt(gtdt->virtual_timer_interrupt,
-		gtdt->virtual_timer_flags);
+		acpi_gtdt_map_ppi(ARCH_TIMER_VIRT_PPI);
 
 	arch_timer_ppi[ARCH_TIMER_HYP_PPI] =
-		map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt,
-		gtdt->non_secure_el2_flags);
+		acpi_gtdt_map_ppi(ARCH_TIMER_HYP_PPI);
 
 	arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
 
@@ -1452,7 +1432,7 @@ 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_c3stop = acpi_gtdt_c3stop(arch_timer_uses_ppi);
 
 	/* Check for globally applicable workarounds */
 	arch_timer_check_ool_workaround(ate_match_acpi_oem_info, table);
-- 
1.9.1