ARM: OMAP: add support for oscillator setup

This contains startup and shutdown times for the oscillator. By default
use ULONG_MAX. Oscillator setup is used for calculating and setting up
latencies for sleep modes that disable oscillator.

Based on a patch from Nishanth Menon <nm@ti.com>.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index ea61c32957bd..109a02e02d72 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -39,6 +39,36 @@ static struct omap_device_pm_latency *pm_lats;
  */
 int (*omap_pm_suspend)(void);
 
+/**
+ * struct omap2_oscillator - Describe the board main oscillator latencies
+ * @startup_time: oscillator startup latency
+ * @shutdown_time: oscillator shutdown latency
+ */
+struct omap2_oscillator {
+        u32 startup_time;
+        u32 shutdown_time;
+};
+
+static struct omap2_oscillator oscillator = {
+        .startup_time = ULONG_MAX,
+        .shutdown_time = ULONG_MAX,
+};
+
+void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
+{
+        oscillator.startup_time = tstart;
+        oscillator.shutdown_time = tshut;
+}
+
+void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
+{
+        if (!tstart || !tshut)
+                return;
+
+        *tstart = oscillator.startup_time;
+        *tshut = oscillator.shutdown_time;
+}
+
 static int __init _init_omap_device(char *name)
 {
         struct omap_hwmod *oh;