OMAP: McBSP: Provide functions for ASoC frame syncronization

ASoC has an annoying bug letting either L or R channel to be
played on L channel. In other words, L and R channels can
switch at random. This provides McBSP funtionality that may
be used to fix this feature.

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

2 files changed, 54 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index 57249bb1e9b..b85e6e600ed 100644
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -389,6 +389,8 @@ int omap_mcbsp_request(unsigned int id);
 void omap_mcbsp_free(unsigned int id);
 void omap_mcbsp_start(unsigned int id, int tx, int rx);
 void omap_mcbsp_stop(unsigned int id, int tx, int rx);
+void omap_mcbsp_xmit_enable(unsigned int id, u8 enable);
+void omap_mcbsp_recv_enable(unsigned int id, u8 enable);
 void omap_mcbsp_xmit_word(unsigned int id, u32 word);
 u32 omap_mcbsp_recv_word(unsigned int id);
 
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index a3d2313460b..0aa2524186f 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -412,6 +412,58 @@ void omap_mcbsp_stop(unsigned int id, int tx, int rx)
 }
 EXPORT_SYMBOL(omap_mcbsp_stop);
 
+void omap_mcbsp_xmit_enable(unsigned int id, u8 enable)
+{
+        struct omap_mcbsp *mcbsp;
+        void __iomem *io_base;
+        u16 w;
+
+        if (!(cpu_is_omap2430() || cpu_is_omap34xx()))
+                return;
+
+        if (!omap_mcbsp_check_valid_id(id)) {
+                printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+                return;
+        }
+
+        mcbsp = id_to_mcbsp_ptr(id);
+        io_base = mcbsp->io_base;
+
+        w = OMAP_MCBSP_READ(io_base, XCCR);
+
+        if (enable)
+                OMAP_MCBSP_WRITE(io_base, XCCR, w & ~(XDISABLE));
+        else
+                OMAP_MCBSP_WRITE(io_base, XCCR, w | XDISABLE);
+}
+EXPORT_SYMBOL(omap_mcbsp_xmit_enable);
+
+void omap_mcbsp_recv_enable(unsigned int id, u8 enable)
+{
+        struct omap_mcbsp *mcbsp;
+        void __iomem *io_base;
+        u16 w;
+
+        if (!(cpu_is_omap2430() || cpu_is_omap34xx()))
+                return;
+
+        if (!omap_mcbsp_check_valid_id(id)) {
+                printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+                return;
+        }
+
+        mcbsp = id_to_mcbsp_ptr(id);
+        io_base = mcbsp->io_base;
+
+        w = OMAP_MCBSP_READ(io_base, RCCR);
+
+        if (enable)
+                OMAP_MCBSP_WRITE(io_base, RCCR, w & ~(RDISABLE));
+        else
+                OMAP_MCBSP_WRITE(io_base, RCCR, w | RDISABLE);
+}
+EXPORT_SYMBOL(omap_mcbsp_recv_enable);
+
 /* polled mcbsp i/o operations */
 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 {