mcs814x: fix interrupt handling

Switch to generich chip irqs/irq domains.
Interrupts were broken since kernel 3.14. dLAN USB extender is now
booting again.

Signed-off-by: Günther Kelleter <guenther.kelleter@devolo.de>

Backport of r46647

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@47193 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 27 insertions, 22 deletions

diff --git a/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/irq.c b/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/irq.c
index f84c412839..d1cab682e4 100644
--- a/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/irq.c
+++ b/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/irq.c
@@ -17,6 +17,7 @@
 #include <mach/mcs814x.h>
 
 static void __iomem *mcs814x_intc_base;
+static struct irq_domain *domain;
 
 static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start,
 					unsigned int num)
@@ -24,11 +25,15 @@ static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start,
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
 
-	gc = irq_alloc_generic_chip("mcs814x-intc", 1,
-			irq_start, base, handle_level_irq);
+	if (irq_alloc_domain_generic_chips(domain, num, 1, "mcs814x-intc", handle_level_irq,
+                IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST, 0))
+		panic("unable to allocate domain generic irq chip");
+
+	gc = irq_get_domain_generic_chip(domain, irq_start);
 	if (!gc)
-		panic("unable to allocate generic irq chip");
+		panic("unable to get generic irq chip");
 
+	gc->reg_base = base;
 	ct = gc->chip_types;
 	ct->chip.irq_ack = irq_gc_unmask_enable_reg;
 	ct->chip.irq_mask = irq_gc_mask_clr_bit;
@@ -36,9 +41,6 @@ static void __init mcs814x_alloc_gc(void __iomem *base, unsigned int irq_start,
 	ct->regs.mask = MCS814X_IRQ_MASK;
 	ct->regs.enable = MCS814X_IRQ_ICR;
 
-	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
-		IRQ_NOREQUEST, 0);
-
 	/* Clear all interrupts */
 	writel_relaxed(0xffffffff, base + MCS814X_IRQ_ICR);
 }
@@ -58,7 +60,7 @@ asmlinkage void __exception_irq_entry mcs814x_handle_irq(struct pt_regs *regs)
 		/* clear the interrupt */
 		__raw_writel(status, mcs814x_intc_base + MCS814X_IRQ_STS0);
 		/* call the generic handler */
-		handle_IRQ(irq, regs);
+		handle_domain_irq(domain, irq, regs);
 
 	} while (1);
 }
@@ -80,7 +82,10 @@ void __init mcs814x_of_irq_init(void)
 	if (!mcs814x_intc_base)
 		panic("unable to map intc cpu registers\n");
 
-	irq_domain_add_simple(np, 32, 0, &irq_generic_chip_ops, NULL);
+	domain = irq_domain_add_linear(np, 32, &irq_generic_chip_ops, NULL);
+	if (!domain)
+		panic("unable to add irq domain\n");
+	irq_set_default_host(domain);
 
 	of_node_put(np);
 
diff --git a/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/timer.c b/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/timer.c
index ff9d44aa6e..31d0ba65a7 100644
--- a/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/timer.c
+++ b/target/linux/mcs814x/files-3.18/arch/arm/mach-mcs814x/timer.c
@@ -15,6 +15,7 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_irq.h>
 
 #include <asm/mach/time.h>
 #include <mach/mcs814x.h>
@@ -71,21 +72,15 @@ static irqreturn_t mcs814x_timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction mcs814x_timer_irq = {
-	.name		= "mcs814x-timer",
-	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= mcs814x_timer_interrupt,
-};
-
 static struct of_device_id mcs814x_timer_ids[] = {
 	{ .compatible = "moschip,mcs814x-timer" },
 	{ /* sentinel */ },
 };
 
-static void __init mcs814x_of_timer_init(void)
+static int __init mcs814x_of_timer_init(void)
 {
 	struct device_node *np;
-	const unsigned int *intspec;
+	int irq;
 
 	np = of_find_matching_node(NULL, mcs814x_timer_ids);
 	if (!np)
@@ -95,16 +90,17 @@ static void __init mcs814x_of_timer_init(void)
 	if (!mcs814x_timer_base)
 		panic("unable to remap timer cpu registers");
 
-	intspec = of_get_property(np, "interrupts", NULL);
-	if (!intspec)
-		panic("no interrupts property for timer");
+	irq = irq_of_parse_and_map(np, 0);
+	if (!irq)
+		panic("no interrupts property/mapping failed for timer");
 
-	mcs814x_timer_irq.irq = be32_to_cpup(intspec);
+	return irq;
 }
 
 void __init mcs814x_timer_init(void)
 {
 	struct clk *clk;
+	int irq;
 
 	arch_gettimeoffset = mcs814x_gettimeoffset;
 
@@ -114,7 +110,7 @@ void __init mcs814x_timer_init(void)
 
 	clock_rate = clk_get_rate(clk);
 
-	mcs814x_of_timer_init();
+	irq = mcs814x_of_timer_init();
 
 	pr_info("Timer frequency: %d (kHz)\n", clock_rate / 1000);
 
@@ -125,7 +121,11 @@ void __init mcs814x_timer_init(void)
 	writel_relaxed(timer_reload_value, mcs814x_timer_base + TIMER_VAL);
 	last_reload = timer_reload_value;
 
-	setup_irq(mcs814x_timer_irq.irq, &mcs814x_timer_irq);
+	if (request_irq(irq, mcs814x_timer_interrupt,
+		IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+		"mcs814x-timer", NULL))
+		panic("unable to request timer0 irq %d", irq);
+
 	/* enable timer, stop timer in debug mode */
 	writel_relaxed(TIMER_CTL_EN | TIMER_CTL_DBG,
 		mcs814x_timer_base + TIMER_CTL);