ARM: OMAP2+: McBSP: Correct CLKR/FSR clock source mux configuration

On OMAP2/3 McBSP1 port has 6 pin setup, while on OMAP4 the port is McBSP4.
Implement the CLKR/FSR clock mux selection for OMAP4, and make sure that
we add the correct callback for the correct port across supported OMAP
versions.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>

1 files changed, 44 insertions, 2 deletions

diff --git a/arch/arm/mach-omap2/mcbsp.c b/arch/arm/mach-omap2/mcbsp.c
index 49ff5b80454f..ecc039e794db 100644
--- a/arch/arm/mach-omap2/mcbsp.c
+++ b/arch/arm/mach-omap2/mcbsp.c
@@ -34,7 +34,7 @@
 #include "cm2xxx_3xxx.h"
 #include "cm-regbits-34xx.h"
 
-/* McBSP internal signal muxing function */
+/* McBSP1 internal signal muxing function for OMAP2/3 */
 static int omap2_mcbsp1_mux_rx_clk(struct device *dev, const char *signal,
                                    const char *src)
 {
@@ -65,6 +65,42 @@ static int omap2_mcbsp1_mux_rx_clk(struct device *dev, const char *signal,
         return 0;
 }
 
+/* McBSP4 internal signal muxing function for OMAP4 */
+#define OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX     (1 << 31)
+#define OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX    (1 << 30)
+static int omap4_mcbsp4_mux_rx_clk(struct device *dev, const char *signal,
+                                   const char *src)
+{
+        u32 v;
+
+        /*
+         * In CONTROL_MCBSPLP register only bit 30 (CLKR mux), and bit 31 (FSR
+         * mux) is used */
+        v = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MCBSPLP);
+
+        if (!strcmp(signal, "clkr")) {
+                if (!strcmp(src, "clkr"))
+                        v &= ~OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX;
+                else if (!strcmp(src, "clkx"))
+                        v |= OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_CLKX;
+                else
+                        return -EINVAL;
+        } else if (!strcmp(signal, "fsr")) {
+                if (!strcmp(src, "fsr"))
+                        v &= ~OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX;
+                else if (!strcmp(src, "fsx"))
+                        v |= OMAP4_CONTROL_MCBSPLP_ALBCTRLRX_FSX;
+                else
+                        return -EINVAL;
+        } else {
+                return -EINVAL;
+        }
+
+        omap4_ctrl_pad_writel(v, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_MCBSPLP);
+
+        return 0;
+}
+
 /* McBSP CLKS source switching function */
 static int omap2_mcbsp_set_clk_src(struct device *dev, struct clk *clk,
                                    const char *src)
@@ -146,9 +182,15 @@ static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
                 pdata->has_ccr = true;
         }
         pdata->set_clk_src = omap2_mcbsp_set_clk_src;
-        if (id == 1)
+
+        /* On OMAP2/3 the McBSP1 port has 6 pin configuration */
+        if (id == 1 && oh->class->rev < MCBSP_CONFIG_TYPE4)
                 pdata->mux_signal = omap2_mcbsp1_mux_rx_clk;
 
+        /* On OMAP4 the McBSP4 port has 6 pin configuration */
+        if (id == 4 && oh->class->rev == MCBSP_CONFIG_TYPE4)
+                pdata->mux_signal = omap4_mcbsp4_mux_rx_clk;
+
         if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
                 if (id == 2)
                         /* The FIFO has 1024 + 256 locations */