clocksource: omap/dmtimer: ipipe: add support for user-visible TSC

Expose the clocksource to userland processes via the ARM-specific
user-TSC interface.

arch/arm/plat-omap/dmtimer.c

@@ -395,6 +395,18 @@ int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
 }
 EXPORT_SYMBOL_GPL(omap_dm_timer_get_irq);
 
+#ifdef CONFIG_IPIPE
+unsigned long omap_dm_timer_get_phys_counter_addr(struct omap_dm_timer *timer)
+{
+	return timer->phys_base + (OMAP_TIMER_COUNTER_REG & 0xff);
+}
+
+unsigned long omap_dm_timer_get_virt_counter_addr(struct omap_dm_timer *timer)
+{
+	return (unsigned long)timer->io_base + (OMAP_TIMER_COUNTER_REG & 0xff);
+}
+#endif /* CONFIG_IPIPE */
+
 #if defined(CONFIG_ARCH_OMAP1)
 #include <mach/hardware.h>
 /**
@@ -572,7 +584,7 @@ int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 EXPORT_SYMBOL_GPL(omap_dm_timer_set_source);
 
 int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
-			    unsigned int load)
+                            unsigned int load)
 {
 	u32 l;
 
@@ -599,7 +611,7 @@ EXPORT_SYMBOL_GPL(omap_dm_timer_set_load);
 
 /* Optimized set_load which removes costly spin wait in timer_start */
 int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
-                            unsigned int load)
+			    unsigned int load)
 {
 	u32 l;
 
@@ -864,6 +876,7 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
 	}
 
 	timer->fclk = ERR_PTR(-ENODEV);
+	timer->phys_base = mem->start;
 	timer->io_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(timer->io_base))
 		return PTR_ERR(timer->io_base);

arch/arm/plat-omap/include/plat/dmtimer.h

@@ -104,6 +104,7 @@ struct omap_dm_timer {
 	int irq;
 	struct clk *fclk;
 
+	unsigned long	phys_base;
 	void __iomem	*io_base;
 	void __iomem	*irq_stat;	/* TISR/IRQSTATUS interrupt status */
 	void __iomem	*irq_ena;	/* irq enable */
@@ -415,4 +416,9 @@ static inline void __omap_dm_timer_write_status(struct omap_dm_timer *timer,
 	writel_relaxed(value, timer->irq_stat);
 }
 
+static inline unsigned long __omap_dm_timer_read_status(struct omap_dm_timer *timer)
+{
+	return __raw_readl(timer->irq_stat);
+}
+
 #endif /* __ASM_ARCH_DMTIMER_H */