1 files changed, 62 insertions, 27 deletions

diff --git a/arch/arm/mach-clps711x/common.c b/arch/arm/mach-clps711x/common.c
index 20ff50f3ccf..f6d1746366d 100644
--- a/arch/arm/mach-clps711x/common.c
+++ b/arch/arm/mach-clps711x/common.c
@@ -27,12 +27,14 @@
 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/clockchips.h>
+#include <linux/clocksource.h>
 #include <linux/clk-provider.h>
 
 #include <asm/exception.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
+#include <asm/sched_clock.h>
 #include <asm/system_misc.h>
 
 #include <mach/hardware.h>
@@ -213,7 +215,7 @@ void __init clps711x_init_irq(void)
 	}
 }
 
-inline u32 fls16(u32 x)
+static inline u32 fls16(u32 x)
 {
 	u32 r = 15;
 
@@ -237,27 +239,52 @@ inline u32 fls16(u32 x)
 
 asmlinkage void __exception_irq_entry clps711x_handle_irq(struct pt_regs *regs)
 {
-	u32 irqstat;
-	void __iomem *base = CLPS711X_VIRT_BASE;
-
-	irqstat = readl_relaxed(base + INTSR1) & readl_relaxed(base + INTMR1);
-	if (irqstat) {
-		handle_IRQ(fls16(irqstat), regs);
-		return;
-	}
+	do {
+		u32 irqstat;
+		void __iomem *base = CLPS711X_VIRT_BASE;
+
+		irqstat = readw_relaxed(base + INTSR1) &
+			  readw_relaxed(base + INTMR1);
+		if (irqstat)
+			handle_IRQ(fls16(irqstat), regs);
+
+		irqstat = readw_relaxed(base + INTSR2) &
+			  readw_relaxed(base + INTMR2);
+		if (irqstat) {
+			handle_IRQ(fls16(irqstat) + 16, regs);
+			continue;
+		}
+
+		break;
+	} while (1);
+}
 
-	irqstat = readl_relaxed(base + INTSR2) & readl_relaxed(base + INTMR2);
-	if (likely(irqstat))
-		handle_IRQ(fls16(irqstat) + 16, regs);
+static u32 notrace clps711x_sched_clock_read(void)
+{
+	return ~readw_relaxed(CLPS711X_VIRT_BASE + TC1D);
 }
 
 static void clps711x_clockevent_set_mode(enum clock_event_mode mode,
 					 struct clock_event_device *evt)
 {
+	disable_irq(IRQ_TC2OI);
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		enable_irq(IRQ_TC2OI);
+		break;
+	case CLOCK_EVT_MODE_ONESHOT:
+		/* Not supported */
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_RESUME:
+		/* Left event sources disabled, no more interrupts appear */
+		break;
+	}
 }
 
 static struct clock_event_device clockevent_clps711x = {
-	.name		= "CLPS711x Clockevents",
+	.name		= "clps711x-clockevent",
 	.rating		= 300,
 	.features	= CLOCK_EVT_FEAT_PERIODIC,
 	.set_mode	= clps711x_clockevent_set_mode,
@@ -271,8 +298,8 @@ static irqreturn_t clps711x_timer_interrupt(int irq, void *dev_id)
 }
 
 static struct irqaction clps711x_timer_irq = {
-	.name		= "CLPS711x Timer Tick",
-	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+	.name		= "clps711x-timer",
+	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
 	.handler	= clps711x_timer_interrupt,
 };
 
@@ -301,6 +328,7 @@ void __init clps711x_timer_init(void)
 		cpu = ext;
 		bus = cpu;
 		spi = 135400;
+		pll = 0;
 	} else {
 		cpu = pll;
 		if (cpu >= 36864000)
@@ -319,9 +347,9 @@ void __init clps711x_timer_init(void)
 		else
 			timh = 541440;
 	} else
-		timh = cpu / 144;
+		timh = DIV_ROUND_CLOSEST(cpu, 144);
 
-	timl = timh / 256;
+	timl = DIV_ROUND_CLOSEST(timh, 256);
 
 	/* All clocks are fixed */
 	add_fixed_clk(clk_pll, "pll", pll);
@@ -334,13 +362,24 @@ void __init clps711x_timer_init(void)
 
 	pr_info("CPU frequency set at %i Hz.\n", cpu);
 
+	/* Start Timer1 in free running mode (Low frequency) */
+	tmp = clps_readl(SYSCON1) & ~(SYSCON1_TC1S | SYSCON1_TC1M);
+	clps_writel(tmp, SYSCON1);
+
+	setup_sched_clock(clps711x_sched_clock_read, 16, timl);
+
+	clocksource_mmio_init(CLPS711X_VIRT_BASE + TC1D,
+			      "clps711x_clocksource", timl, 300, 16,
+			      clocksource_mmio_readw_down);
+
+	/* Set Timer2 prescaler */
 	clps_writew(DIV_ROUND_CLOSEST(timh, HZ), TC2D);
 
-	tmp = clps_readl(SYSCON1);
-	tmp |= SYSCON1_TC2S | SYSCON1_TC2M;
+	/* Start Timer2 in prescale mode (High frequency)*/
+	tmp = clps_readl(SYSCON1) | SYSCON1_TC2M | SYSCON1_TC2S;
 	clps_writel(tmp, SYSCON1);
 
-	clockevents_config_and_register(&clockevent_clps711x, timh, 1, 0xffff);
+	clockevents_config_and_register(&clockevent_clps711x, timh, 0, 0);
 
 	setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
 }
@@ -353,15 +392,11 @@ void clps711x_restart(char mode, const char *cmd)
 static void clps711x_idle(void)
 {
 	clps_writel(1, HALT);
-	__asm__ __volatile__(
-	"mov    r0, r0\n\
-	mov     r0, r0");
+	asm("mov r0, r0");
+	asm("mov r0, r0");
 }
 
-static int __init clps711x_idle_init(void)
+void __init clps711x_init_early(void)
 {
 	arm_pm_idle = clps711x_idle;
-	return 0;
 }
-
-arch_initcall(clps711x_idle_init);