ARM: OMAP3/OMAP4: PRM: add prm_features flags and add IO wakeup under it

prm_features flag will contain SoC specific feature enabler flags. Initially
IO wakeup is added under this. Helps to get rid of runtime cpu_is_X checks.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/prm.h

@@ -17,10 +17,18 @@
 
 # ifndef __ASSEMBLER__
 extern void __iomem *prm_base;
+extern u16 prm_features;
 extern void omap2_set_globals_prm(void __iomem *prm);
 int of_prcm_init(void);
 # endif
 
+/*
+ * prm_features flag values
+ *
+ * PRM_HAS_IO_WAKEUP: has IO wakeup capability
+ * PRM_HAS_VOLTAGE: has voltage domains
+ */
+#define PRM_HAS_IO_WAKEUP	(1 << 0)
 
 /*
  * MAX_MODULE_SOFTRESET_WAIT: Maximum microseconds to wait for OMAP

arch/arm/mach-omap2/prm3xxx.c

@@ -247,7 +247,7 @@ void omap3xxx_prm_reconfigure_io_chain(void)
  */
 static void __init omap3xxx_prm_enable_io_wakeup(void)
 {
-	if (omap3_has_io_wakeup())
+	if (prm_features & PRM_HAS_IO_WAKEUP)
 		omap2_prm_set_mod_reg_bits(OMAP3430_EN_IO_MASK, WKUP_MOD,
 					   PM_WKEN);
 }
@@ -407,6 +407,9 @@ static struct prm_ll_data omap3xxx_prm_ll_data = {
 
 int __init omap3xxx_prm_init(void)
 {
+	if (omap3_has_io_wakeup())
+		prm_features |= PRM_HAS_IO_WAKEUP;
+
 	return prm_register(&omap3xxx_prm_ll_data);
 }
 
@@ -417,6 +420,9 @@ static int __init omap3xxx_prm_late_init(void)
 	if (!cpu_is_omap34xx())
 		return 0;
 
+	if (!(prm_features & PRM_HAS_IO_WAKEUP))
+		return 0;
+
 	omap3xxx_prm_enable_io_wakeup();
 	ret = omap_prcm_register_chain_handler(&omap3_prcm_irq_setup);
 	if (!ret)

arch/arm/mach-omap2/prm44xx.c

@@ -661,6 +661,9 @@ static struct prm_ll_data omap44xx_prm_ll_data = {
 
 int __init omap44xx_prm_init(void)
 {
+	if (cpu_is_omap44xx())
+		prm_features |= PRM_HAS_IO_WAKEUP;
+
 	return prm_register(&omap44xx_prm_ll_data);
 }
 
@@ -669,6 +672,9 @@ static int __init omap44xx_prm_late_init(void)
 	if (!cpu_is_omap44xx())
 		return 0;
 
+	if (!(prm_features & PRM_HAS_IO_WAKEUP))
+		return 0;
+
 	omap44xx_prm_enable_io_wakeup();
 
 	return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);

arch/arm/mach-omap2/prm_common.c

@@ -62,6 +62,8 @@ static struct omap_prcm_irq_setup *prcm_irq_setup;
 /* prm_base: base virtual address of the PRM IP block */
 void __iomem *prm_base;
 
+u16 prm_features;
+
 /*
  * prm_ll_data: function pointers to SoC-specific implementations of
  * common PRM functions