OMAP: McBSP: Wakeups utilized

This patch enables the smart idle mode while
McBPS is being utilized. Once it's done,
force idle mode is taken instead. Apart of it,
it also configures what signals will wake mcbsp up.

Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@nokia.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 9e699947a693..136f8c5d0dac 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -305,6 +305,46 @@ int omap_mcbsp_get_dma_op_mode(unsigned int id)
         return dma_op_mode;
 }
 EXPORT_SYMBOL(omap_mcbsp_get_dma_op_mode);
+
+static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp)
+{
+        /*
+         * Enable wakup behavior, smart idle and all wakeups
+         * REVISIT: some wakeups may be unnecessary
+         */
+        if (cpu_is_omap34xx()) {
+                u16 syscon;
+
+                syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
+                syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03));
+                syscon |= (ENAWAKEUP | SIDLEMODE(0x02));
+                OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+
+                OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, WAKEUPEN_ALL);
+        }
+}
+
+static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
+{
+        /*
+         * Disable wakup behavior, smart idle and all wakeups
+         */
+        if (cpu_is_omap34xx()) {
+                u16 syscon;
+                u16 wakeupen;
+
+                syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
+                syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03));
+                OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+
+                wakeupen = OMAP_MCBSP_READ(mcbsp->io_base, WAKEUPEN);
+                wakeupen &= ~WAKEUPEN_ALL;
+                OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, wakeupen);
+        }
+}
+#else
+static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp) {}
+static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp) {}
 #endif
 
 /*
@@ -366,6 +406,9 @@ int omap_mcbsp_request(unsigned int id)
         clk_enable(mcbsp->iclk);
         clk_enable(mcbsp->fclk);
 
+        /* Do procedure specific to omap34xx arch, if applicable */
+        omap34xx_mcbsp_request(mcbsp);
+
         /*
          * Make sure that transmitter, receiver and sample-rate generator are
          * not running before activating IRQs.
@@ -414,6 +457,9 @@ void omap_mcbsp_free(unsigned int id)
         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
                 mcbsp->pdata->ops->free(id);
 
+        /* Do procedure specific to omap34xx arch, if applicable */
+        omap34xx_mcbsp_free(mcbsp);
+
         clk_disable(mcbsp->fclk);
         clk_disable(mcbsp->iclk);