ARM: OMAP3+: PRM: Enable IO wake up

Enable IO Wake up for OMAP3/4 as part of PRM Init. Currently this has been
managed in cpuidle path which is not the right place. Subsequent patch
will remove IO Daisy chain handling in cpuidle path once daisy chain is
handled as part of hwmod mux. This patch also moves the OMAP4 IO wakeup
enable code from the trigger function to init time setup.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Reviewed-by: Rajendra Nayak <rnayak@ti.com>
[paul@pwsan.com: harmonize function names with other PRM functions; add
 kerneldoc; resolve checkpatch warnings]
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 19 insertions, 12 deletions

diff --git a/arch/arm/mach-omap2/prm44xx.c b/arch/arm/mach-omap2/prm44xx.c
index 28ffbc55f8d6..bb727c2d9337 100644
--- a/arch/arm/mach-omap2/prm44xx.c
+++ b/arch/arm/mach-omap2/prm44xx.c
@@ -245,17 +245,6 @@ void omap44xx_prm_restore_irqen(u32 *saved_mask)
 void omap44xx_prm_reconfigure_io_chain(void)
 {
 	int i = 0;
-	u32 v;
-
-	v = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
-				    OMAP4_PRM_IO_PMCTRL_OFFSET);
-
-	/* Enable GLOBAL_WUEN */
-	if (!(v & OMAP4430_GLOBAL_WUEN_MASK))
-		omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
-					    OMAP4430_GLOBAL_WUEN_MASK,
-					    OMAP4430_PRM_DEVICE_INST,
-					    OMAP4_PRM_IO_PMCTRL_OFFSET);
 
 	/* Trigger WUCLKIN enable */
 	omap4_prm_rmw_inst_reg_bits(OMAP4430_WUCLK_CTRL_MASK,
@@ -287,10 +276,28 @@ void omap44xx_prm_reconfigure_io_chain(void)
 	return;
 }
 
+/**
+ * omap44xx_prm_enable_io_wakeup - enable wakeup events from I/O wakeup latches
+ *
+ * Activates the I/O wakeup event latches and allows events logged by
+ * those latches to signal a wakeup event to the PRCM.  For I/O wakeups
+ * to occur, WAKEUPENABLE bits must be set in the pad mux registers, and
+ * omap44xx_prm_reconfigure_io_chain() must be called.  No return value.
+ */
+static void __init omap44xx_prm_enable_io_wakeup(void)
+{
+	omap4_prm_rmw_inst_reg_bits(OMAP4430_GLOBAL_WUEN_MASK,
+				    OMAP4430_GLOBAL_WUEN_MASK,
+				    OMAP4430_PRM_DEVICE_INST,
+				    OMAP4_PRM_IO_PMCTRL_OFFSET);
+}
+
 static int __init omap4xxx_prcm_init(void)
 {
-	if (cpu_is_omap44xx())
+	if (cpu_is_omap44xx()) {
+		omap44xx_prm_enable_io_wakeup();
 		return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
+	}
 	return 0;
 }
 subsys_initcall(omap4xxx_prcm_init);