OMAP: McBSP: implement McBSP CLKR and FSR signal muxing via mach-omap2/mcbsp.c

The OMAP ASoC McBSP code implemented CLKR and FSR signal muxing via
direct System Control Module writes on OMAP2+.  This required the
omap_ctrl_{read,write}l() functions to be exported, which is against
policy: the only code that should call those functions directly is
OMAP core code, not device drivers.  omap_ctrl_{read,write}*() are no
longer exported, so the driver no longer builds as a module.

Fix the pinmuxing part of the problem by removing calls to
omap_ctrl_{read,write}l() from the OMAP ASoC McBSP code and
implementing signal muxing functions in arch/arm/mach-omap2/mcbsp.c.
Due to the unfortunate way that McBSP support is implemented in ASoC
and the OMAP tree, these symbols must be exported for use by
sound/soc/omap/omap-mcbsp.c.

Going forward, the McBSP device driver should be moved from
arch/arm/*omap* into drivers/ or sound/soc/*, and the CPU DAI driver
should be implemented as a platform_driver as many other ASoC CPU DAI
drivers are.  These two steps should resolve many of the layering
problems, which will rapidly reappear during a McBSP hwmod/PM runtime
conversion.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/mcbsp.c b/arch/arm/mach-omap2/mcbsp.c
index 88b8790e4fec..4c9c999dfa4a 100644
--- a/arch/arm/mach-omap2/mcbsp.c
+++ b/arch/arm/mach-omap2/mcbsp.c
@@ -22,7 +22,37 @@
 #include <plat/dma.h>
 #include <plat/cpu.h>
 #include <plat/mcbsp.h>
+#include <plat/control.h>
 
+/* McBSP internal signal muxing functions */
+
+void omap2_mcbsp1_mux_clkr_src(u8 mux)
+{
+        u32 v;
+
+        v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
+        if (mux == CLKR_SRC_CLKR)
+                v &= OMAP2_MCBSP1_CLKR_MASK;
+        else if (mux == CLKR_SRC_CLKX)
+                v |= OMAP2_MCBSP1_CLKR_MASK;
+        omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
+}
+EXPORT_SYMBOL(omap2_mcbsp1_mux_clkr_src);
+
+void omap2_mcbsp1_mux_fsr_src(u8 mux)
+{
+        u32 v;
+
+        v = omap_ctrl_readl(OMAP2_CONTROL_DEVCONF0);
+        if (mux == FSR_SRC_FSR)
+                v &= OMAP2_MCBSP1_FSR_MASK;
+        else if (mux == FSR_SRC_FSX)
+                v |= OMAP2_MCBSP1_FSR_MASK;
+        omap_ctrl_writel(v, OMAP2_CONTROL_DEVCONF0);
+}
+EXPORT_SYMBOL(omap2_mcbsp1_mux_fsr_src);
+
+/* Platform data */
 
 #ifdef CONFIG_ARCH_OMAP2420
 static struct omap_mcbsp_platform_data omap2420_mcbsp_pdata[] = {