ARM: OMAP3: PRM: move prcm wakeup helper to prm driver

Done in preparation to make the prm an individual driver.

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

1 files changed, 53 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prm3xxx.c b/arch/arm/mach-omap2/prm3xxx.c
index 4bd7a2dca8af..014ba70d2dfb 100644
--- a/arch/arm/mach-omap2/prm3xxx.c
+++ b/arch/arm/mach-omap2/prm3xxx.c
@@ -26,6 +26,8 @@
 #include "prm2xxx_3xxx.h"
 #include "cm2xxx_3xxx.h"
 #include "prm-regbits-34xx.h"
+#include "cm3xxx.h"
+#include "cm-regbits-34xx.h"
 
 static const struct omap_prcm_irq omap3_prcm_irqs[] = {
 	OMAP_PRCM_IRQ("wkup",	0,	0),
@@ -206,6 +208,57 @@ void omap3xxx_prm_restore_irqen(u32 *saved_mask)
 }
 
 /**
+ * omap3xxx_prm_clear_mod_irqs - clear wake-up events from PRCM interrupt
+ * @module: PRM module to clear wakeups from
+ * @regs: register set to clear, 1 or 3
+ * @ignore_bits: wakeup status bits to ignore
+ *
+ * The purpose of this function is to clear any wake-up events latched
+ * in the PRCM PM_WKST_x registers. It is possible that a wake-up event
+ * may occur whilst attempting to clear a PM_WKST_x register and thus
+ * set another bit in this register. A while loop is used to ensure
+ * that any peripheral wake-up events occurring while attempting to
+ * clear the PM_WKST_x are detected and cleared.
+ */
+int omap3xxx_prm_clear_mod_irqs(s16 module, u8 regs, u32 ignore_bits)
+{
+	u32 wkst, fclk, iclk, clken;
+	u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
+	u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
+	u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
+	u16 grpsel_off = (regs == 3) ?
+		OMAP3430ES2_PM_MPUGRPSEL3 : OMAP3430_PM_MPUGRPSEL;
+	int c = 0;
+
+	wkst = omap2_prm_read_mod_reg(module, wkst_off);
+	wkst &= omap2_prm_read_mod_reg(module, grpsel_off);
+	wkst &= ~ignore_bits;
+	if (wkst) {
+		iclk = omap2_cm_read_mod_reg(module, iclk_off);
+		fclk = omap2_cm_read_mod_reg(module, fclk_off);
+		while (wkst) {
+			clken = wkst;
+			omap2_cm_set_mod_reg_bits(clken, module, iclk_off);
+			/*
+			 * For USBHOST, we don't know whether HOST1 or
+			 * HOST2 woke us up, so enable both f-clocks
+			 */
+			if (module == OMAP3430ES2_USBHOST_MOD)
+				clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
+			omap2_cm_set_mod_reg_bits(clken, module, fclk_off);
+			omap2_prm_write_mod_reg(wkst, module, wkst_off);
+			wkst = omap2_prm_read_mod_reg(module, wkst_off);
+			wkst &= ~ignore_bits;
+			c++;
+		}
+		omap2_cm_write_mod_reg(iclk, module, iclk_off);
+		omap2_cm_write_mod_reg(fclk, module, fclk_off);
+	}
+
+	return c;
+}
+
+/**
  * omap3xxx_prm_reconfigure_io_chain - clear latches and reconfigure I/O chain
  *
  * Clear any previously-latched I/O wakeup events and ensure that the