OMAP: McBSP: Add link DMA mode selection

It adds a new sysfs file, where the user can configure the mcbsp mode to use.
If the mcbsp channel is in use, it does not allow the change.
Than in omap_pcm_open we can call the omap_mcbsp_get_opmode to get the mode,
store it, than use it to implement the different modes.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@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>

diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index 832330d..bd5b759 100644 (file)
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -255,6 +255,11 @@
 /********************** McBSP SYSCONFIG bit definitions ********************/
 #define SOFTRST                        0x0002
 
+/********************** McBSP DMA operating modes **************************/
+#define MCBSP_DMA_MODE_ELEMENT         0
+#define MCBSP_DMA_MODE_THRESHOLD       1
+#define MCBSP_DMA_MODE_FRAME           2
+
 /* we don't do multichannel for now */
 struct omap_mcbsp_reg_cfg {
        u16 spcr2;
@@ -385,6 +390,7 @@ struct omap_mcbsp {
        struct clk *iclk;
        struct clk *fclk;
 #ifdef CONFIG_ARCH_OMAP34XX
+       int dma_op_mode;
        u16 max_tx_thres;
        u16 max_rx_thres;
 #endif
@@ -401,6 +407,7 @@ void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold);
 void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold);
 u16 omap_mcbsp_get_max_tx_threshold(unsigned int id);
 u16 omap_mcbsp_get_max_rx_threshold(unsigned int id);
+int omap_mcbsp_get_dma_op_mode(unsigned int id);
 #else
 static inline void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
 { }
@@ -408,6 +415,7 @@ static inline void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
 { }
 static inline u16 omap_mcbsp_get_max_tx_threshold(unsigned int id) { return 0; }
 static inline u16 omap_mcbsp_get_max_rx_threshold(unsigned int id) { return 0; }
+static inline int omap_mcbsp_get_dma_op_mode(unsigned int id) { return 0; }
 #endif
 int omap_mcbsp_request(unsigned int id);
 void omap_mcbsp_free(unsigned int id);

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index ccaa9ae..9e69994 100644 (file)
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -282,6 +282,29 @@ u16 omap_mcbsp_get_max_rx_threshold(unsigned int id)
        return mcbsp->max_rx_thres;
 }
 EXPORT_SYMBOL(omap_mcbsp_get_max_rx_threshold);
+
+/*
+ * omap_mcbsp_get_dma_op_mode just return the current configured
+ * operating mode for the mcbsp channel
+ */
+int omap_mcbsp_get_dma_op_mode(unsigned int id)
+{
+       struct omap_mcbsp *mcbsp;
+       int dma_op_mode;
+
+       if (!omap_mcbsp_check_valid_id(id)) {
+               printk(KERN_ERR "%s: Invalid id (%u)\n", __func__, id + 1);
+               return -ENODEV;
+       }
+       mcbsp = id_to_mcbsp_ptr(id);
+
+       spin_lock_irq(&mcbsp->lock);
+       dma_op_mode = mcbsp->dma_op_mode;
+       spin_unlock_irq(&mcbsp->lock);
+
+       return dma_op_mode;
+}
+EXPORT_SYMBOL(omap_mcbsp_get_dma_op_mode);
 #endif
 
 /*
@@ -1077,9 +1100,65 @@ static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
 THRESHOLD_PROP_BUILDER(max_tx_thres);
 THRESHOLD_PROP_BUILDER(max_rx_thres);
 
+static ssize_t dma_op_mode_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
+       int dma_op_mode;
+
+       spin_lock_irq(&mcbsp->lock);
+       dma_op_mode = mcbsp->dma_op_mode;
+       spin_unlock_irq(&mcbsp->lock);
+
+       return sprintf(buf, "current mode: %d\n"
+                       "possible mode values are:\n"
+                       "%d - %s\n"
+                       "%d - %s\n"
+                       "%d - %s\n",
+                       dma_op_mode,
+                       MCBSP_DMA_MODE_ELEMENT, "element mode",
+                       MCBSP_DMA_MODE_THRESHOLD, "threshold mode",
+                       MCBSP_DMA_MODE_FRAME, "frame mode");
+}
+
+static ssize_t dma_op_mode_store(struct device *dev,
+                               struct device_attribute *attr,
+                               const char *buf, size_t size)
+{
+       struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
+       unsigned long val;
+       int status;
+
+       status = strict_strtoul(buf, 0, &val);
+       if (status)
+               return status;
+
+       spin_lock_irq(&mcbsp->lock);
+
+       if (!mcbsp->free) {
+               size = -EBUSY;
+               goto unlock;
+       }
+
+       if (val > MCBSP_DMA_MODE_FRAME || val < MCBSP_DMA_MODE_ELEMENT) {
+               size = -EINVAL;
+               goto unlock;
+       }
+
+       mcbsp->dma_op_mode = val;
+
+unlock:
+       spin_unlock_irq(&mcbsp->lock);
+
+       return size;
+}
+
+static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
+
 static const struct attribute *additional_attrs[] = {
        &dev_attr_max_tx_thres.attr,
        &dev_attr_max_rx_thres.attr,
+       &dev_attr_dma_op_mode.attr,
        NULL,
 };
 
@@ -1099,9 +1178,14 @@ static inline void __devexit omap_additional_remove(struct device *dev)
 
 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
 {
+       mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
        if (cpu_is_omap34xx()) {
                mcbsp->max_tx_thres = max_thres(mcbsp);
                mcbsp->max_rx_thres = max_thres(mcbsp);
+               /*
+                * REVISIT: Set dmap_op_mode to THRESHOLD as default
+                * for mcbsp2 instances.
+                */
                if (omap_additional_add(mcbsp->dev))
                        dev_warn(mcbsp->dev,
                                "Unable to create additional controls\n");