ARM: OMAP4: retrigger localtimers after re-enabling gic

'Workaround for ROM bug because of CA9 r2pX gic control'
register change disables the gic distributor while the secondary
cpu is being booted.  If a localtimer interrupt on the primary cpu
occurs when the distributor is turned off, the interrupt is lost,
and the localtimer never fires again.

Make the primary cpu wait for the secondary cpu to reenable the
gic distributor (with interrupts off for safety), and then
check if the pending bit is set in the localtimer but not the
gic.  If so, ack it in the localtimer, and reset the timer with
the minimum timeout to trigger a new timer interrupt.

Signed-off-by: Colin Cross <ccross@android.com>
[s-jan@ti.com: adapted to k3.4 + validated functionality]
Signed-off-by: Sebastien Jan <s-jan@ti.com>
[t-kristo@ti.com: dropped generic ARM kernel exports from the code, rebased
 to mainline]
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index 72cf396..6f94b4e 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -14,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/irq.h>
 #include <linux/platform_device.h>
 #include <linux/memblock.h>
 #include <linux/of_irq.h>
@@ -24,6 +25,7 @@
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/mach/map.h>
 #include <asm/memblock.h>
+#include <asm/smp_twd.h>
 
 #include <plat/sram.h>
 #include <plat/omap-secure.h>
@@ -42,6 +44,9 @@ static void __iomem *l2cache_base;
 
 static void __iomem *sar_ram_base;
 static void __iomem *gic_dist_base_addr;
+static void __iomem *twd_base;
+
+#define IRQ_LOCALTIMER		29
 
 #ifdef CONFIG_OMAP4_ERRATA_I688
 /* Used to implement memory barrier on DRAM path */
@@ -101,6 +106,9 @@ void __init gic_init_irq(void)
 	gic_dist_base_addr = ioremap(OMAP44XX_GIC_DIST_BASE, SZ_4K);
 	BUG_ON(!gic_dist_base_addr);
 
+	twd_base = ioremap(OMAP44XX_LOCAL_TWD_BASE, SZ_4K);
+	BUG_ON(!twd_base);
+
 	/* Static mapping, never released */
 	omap_irq_base = ioremap(OMAP44XX_GIC_CPU_BASE, SZ_512);
 	BUG_ON(!omap_irq_base);
@@ -116,6 +124,32 @@ void gic_dist_disable(void)
 		__raw_writel(0x0, gic_dist_base_addr + GIC_DIST_CTRL);
 }
 
+bool gic_dist_disabled(void)
+{
+	return !(__raw_readl(gic_dist_base_addr + GIC_DIST_CTRL) & 0x1);
+}
+
+void gic_timer_retrigger(void)
+{
+	u32 twd_int = __raw_readl(twd_base + TWD_TIMER_INTSTAT);
+	u32 gic_int = __raw_readl(gic_dist_base_addr + GIC_DIST_PENDING_SET);
+	u32 twd_ctrl = __raw_readl(twd_base + TWD_TIMER_CONTROL);
+
+	if (twd_int && !(gic_int & BIT(IRQ_LOCALTIMER))) {
+		/*
+		 * The local timer interrupt got lost while the distributor was
+		 * disabled.  Ack the pending interrupt, and retrigger it.
+		 */
+		pr_warn("%s: lost localtimer interrupt\n", __func__);
+		__raw_writel(1, twd_base + TWD_TIMER_INTSTAT);
+		if (!(twd_ctrl & TWD_TIMER_CONTROL_PERIODIC)) {
+			__raw_writel(1, twd_base + TWD_TIMER_COUNTER);
+			twd_ctrl |= TWD_TIMER_CONTROL_ENABLE;
+			__raw_writel(twd_ctrl, twd_base + TWD_TIMER_CONTROL);
+		}
+	}
+}
+
 #ifdef CONFIG_CACHE_L2X0
 
 void __iomem *omap4_get_l2cache_base(void)