Linux Kernels

ARM: EXYNOS: prepare an array of MCT interrupt numbers and use it

This change “ARM: EXYNOS: prepare an array of MCT interrupt numbers and use it” (commit c371dc6) in Linux kernel is authored by Thomas Abraham <thomas.abraham [at] linaro.org> on Sat Mar 9 16:01:50 2013 +0900.

Description of "ARM: EXYNOS: prepare an array of MCT interrupt numbers and use it"

The change “ARM: EXYNOS: prepare an array of MCT interrupt numbers and use it” introduces changes as follows.

ARM: EXYNOS: prepare an array of MCT interrupt numbers and use it

Instead of using soc_is_xxx macro at more than one place in
the MCT controller driver to decide the MCT interrpt number
to be setup, populate a table of known MCT global and local
timer interrupts and use the values in table to setup the MCT
interrupts.

This also helps in adding device tree support for MCT controller
driver by allowing the driver to retrieve interrupt numbers from
device tree and populating them into this table, thereby supporting
both legacy and dt functionality to co-exist.

Cc: Changhwan Youn <chaos.youn@samsung.com>
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

Linux kernel releases containing commit c371dc6

The Linux kernel releases containing this commit are as follows.

Linux kernel code changes from "ARM: EXYNOS: prepare an array of MCT interrupt numbers and use it"

There are 57 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 arch/arm/mach-exynos/mct.c | 57 ++++++++++++++++++++++++--------------
 1 file changed, 36 insertions(+), 21 deletions(-)
 
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
index ffd1323ed7db..1061db4118aa 100644
--- a/arch/arm/mach-exynos/mct.c
+++ b/arch/arm/mach-exynos/mct.c
@@ -65,9 +65,22 @@ enum {
 	MCT_INT_PPI
 };
 
+enum {
+	MCT_G0_IRQ,
+	MCT_G1_IRQ,
+	MCT_G2_IRQ,
+	MCT_G3_IRQ,
+	MCT_L0_IRQ,
+	MCT_L1_IRQ,
+	MCT_L2_IRQ,
+	MCT_L3_IRQ,
+	MCT_NR_IRQS,
+};
+
 static void __iomem *reg_base;
 static unsigned long clk_rate;
 static unsigned int mct_int_type;
+static int mct_irqs[MCT_NR_IRQS];
 
 struct mct_clock_event_device {
 	struct clock_event_device *evt;
@@ -282,11 +295,7 @@ static void exynos4_clockevent_init(void)
 	mct_comp_device.cpumask = cpumask_of(0);
 	clockevents_config_and_register(&mct_comp_device, clk_rate,
 					0xf, 0xffffffff);
-
-	if (soc_is_exynos5250())
-		setup_irq(EXYNOS5_IRQ_MCT_G0, &mct_comp_event_irq);
-	else
-		setup_irq(EXYNOS4_IRQ_MCT_G0, &mct_comp_event_irq);
+	setup_irq(mct_irqs[MCT_G0_IRQ], &mct_comp_event_irq);
 }
 
 #ifdef CONFIG_LOCAL_TIMERS
@@ -410,7 +419,6 @@ static int __cpuinit exynos4_local_timer_setup(struct clock_event_device *evt)
 {
 	struct mct_clock_event_device *mevt;
 	unsigned int cpu = smp_processor_id();
-	int mct_lx_irq;
 
 	mevt = this_cpu_ptr(&percpu_mct_tick);
 	mevt->evt = evt;
@@ -431,21 +439,17 @@ static int __cpuinit exynos4_local_timer_setup(struct clock_event_device *evt)
 
 	if (mct_int_type == MCT_INT_SPI) {
 		if (cpu == 0) {
-			mct_lx_irq = soc_is_exynos4210() ? EXYNOS4_IRQ_MCT_L0 :
-						EXYNOS5_IRQ_MCT_L0;
 			mct_tick0_event_irq.dev_id = mevt;
-			evt->irq = mct_lx_irq;
-			setup_irq(mct_lx_irq, &mct_tick0_event_irq);
+			evt->irq = mct_irqs[MCT_L0_IRQ];
+			setup_irq(evt->irq, &mct_tick0_event_irq);
 		} else {
-			mct_lx_irq = soc_is_exynos4210() ? EXYNOS4_IRQ_MCT_L1 :
-						EXYNOS5_IRQ_MCT_L1;
 			mct_tick1_event_irq.dev_id = mevt;
-			evt->irq = mct_lx_irq;
-			setup_irq(mct_lx_irq, &mct_tick1_event_irq);
-			irq_set_affinity(mct_lx_irq, cpumask_of(1));
+			evt->irq = mct_irqs[MCT_L1_IRQ];
+			setup_irq(evt->irq, &mct_tick1_event_irq);
+			irq_set_affinity(evt->irq, cpumask_of(1));
 		}
 	} else {
-		enable_percpu_irq(EXYNOS_IRQ_MCT_LOCALTIMER, 0);
+		enable_percpu_irq(mct_irqs[MCT_L0_IRQ], 0);
 	}
 
 	return 0;
@@ -461,7 +465,7 @@ static void exynos4_local_timer_stop(struct clock_event_device *evt)
 		else
 			remove_irq(evt->irq, &mct_tick1_event_irq);
 	else
-		disable_percpu_irq(EXYNOS_IRQ_MCT_LOCALTIMER);
+		disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
 }
 
 static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = {
@@ -483,11 +487,11 @@ static void __init exynos4_timer_resources(void)
 	if (mct_int_type == MCT_INT_PPI) {
 		int err;
 
-		err = request_percpu_irq(EXYNOS_IRQ_MCT_LOCALTIMER,
+		err = request_percpu_irq(mct_irqs[MCT_L0_IRQ],
 					 exynos4_mct_tick_isr, "MCT",
 					 &percpu_mct_tick);
 		WARN(err, "MCT: can't request IRQ %d (%d)\n",
-		     EXYNOS_IRQ_MCT_LOCALTIMER, err);
+		     mct_irqs[MCT_L0_IRQ], err);
 	}
 
 	local_timer_register(&exynos4_mct_tick_ops);
@@ -501,10 +505,21 @@ void __init exynos4_timer_init(void)
 		return;
 	}
 
-	if ((soc_is_exynos4210()) || (soc_is_exynos5250()))
+	if (soc_is_exynos4210()) {
+		mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
+		mct_irqs[MCT_L0_IRQ] = EXYNOS4_IRQ_MCT_L0;
+		mct_irqs[MCT_L1_IRQ] = EXYNOS4_IRQ_MCT_L1;
 		mct_int_type = MCT_INT_SPI;
-	else
+	} else if (soc_is_exynos5250()) {
+		mct_irqs[MCT_G0_IRQ] = EXYNOS5_IRQ_MCT_G0;
+		mct_irqs[MCT_L0_IRQ] = EXYNOS5_IRQ_MCT_L0;
+		mct_irqs[MCT_L1_IRQ] = EXYNOS5_IRQ_MCT_L1;
+		mct_int_type = MCT_INT_SPI;
+	} else {
+		mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
+		mct_irqs[MCT_L0_IRQ] = EXYNOS_IRQ_MCT_LOCALTIMER;
 		mct_int_type = MCT_INT_PPI;
+	}
 
 	exynos4_timer_resources();
 	exynos4_clocksource_init();

The commit for this change in Linux stable tree is c371dc6 (patch).

Last modified: 2020/01/11 06:45