ARM: OMAP5 / DRA7: PM / wakeupgen: Enables ES2 PM mode by default

Enables MPUSS ES2 power management mode using ES2_PM_MODE in
AMBA_IF_MODE register.

0x0: OMAP5 ES1 behavior, CPU cores would enter and exit OFF mode together.
     Broken! Fortunately, we do not support this anymore.
0x1: OMAP5 ES2, DRA7 behavior, CPU cores are allowed to enter/exit OFF mode
     independently.

This is one time settings thanks to always ON domain.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
[nm@ti.com: minor conflict resolutions, consolidation for DRA7]
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/omap-wakeupgen.c b/arch/arm/mach-omap2/omap-wakeupgen.c
index 37843a7d3639..e844e1603d76 100644
--- a/arch/arm/mach-omap2/omap-wakeupgen.c
+++ b/arch/arm/mach-omap2/omap-wakeupgen.c
@@ -406,6 +406,7 @@ int __init omap_wakeupgen_init(void)
 {
         int i;
         unsigned int boot_cpu = smp_processor_id();
+        u32 val;
 
         /* Not supported on OMAP4 ES1.0 silicon */
         if (omap_rev() == OMAP4430_REV_ES1_0) {
@@ -451,6 +452,22 @@ int __init omap_wakeupgen_init(void)
         for (i = 0; i < max_irqs; i++)
                 irq_target_cpu[i] = boot_cpu;
 
+        /*
+         * Enables OMAP5 ES2 PM Mode using ES2_PM_MODE in AMBA_IF_MODE
+         * 0x0: ES1 behavior, CPU cores would enter and exit OFF mode together.
+         * 0x1: ES2 behavior, CPU cores are allowed to enter/exit OFF mode
+         * independently.
+         * This needs to be set one time thanks to always ON domain.
+         *
+         * We do not support ES1 behavior anymore. OMAP5 is assumed to be
+         * ES2.0, and the same is applicable for DRA7.
+         */
+        if (soc_is_omap54xx() || soc_is_dra7xx()) {
+                val = __raw_readl(wakeupgen_base + OMAP_AMBA_IF_MODE);
+                val |= BIT(5);
+                omap_smc1(OMAP5_MON_AMBA_IF_INDEX, val);
+        }
+
         irq_hotplug_init();
         irq_pm_init();