Merge branch 'for-2.6.34' into for-2.6.35

[pandora-kernel.git] / arch / arm / plat-omap / mcbsp.c

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 52dfcc8..4ff7a11 100644 (file)
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -559,6 +559,61 @@ u16 omap_mcbsp_get_max_rx_threshold(unsigned int id)
 }
 EXPORT_SYMBOL(omap_mcbsp_get_max_rx_threshold);
 
+#define MCBSP2_FIFO_SIZE       0x500 /* 1024 + 256 locations */
+#define MCBSP1345_FIFO_SIZE    0x80  /* 128 locations */
+/*
+ * omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO
+ */
+u16 omap_mcbsp_get_tx_delay(unsigned int id)
+{
+       struct omap_mcbsp *mcbsp;
+       u16 buffstat;
+
+       if (!omap_mcbsp_check_valid_id(id)) {
+               printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+               return -ENODEV;
+       }
+       mcbsp = id_to_mcbsp_ptr(id);
+
+       /* Returns the number of free locations in the buffer */
+       buffstat = MCBSP_READ(mcbsp, XBUFFSTAT);
+
+       /* Number of slots are different in McBSP ports */
+       if (mcbsp->id == 2)
+               return MCBSP2_FIFO_SIZE - buffstat;
+       else
+               return MCBSP1345_FIFO_SIZE - buffstat;
+}
+EXPORT_SYMBOL(omap_mcbsp_get_tx_delay);
+
+/*
+ * omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO
+ * to reach the threshold value (when the DMA will be triggered to read it)
+ */
+u16 omap_mcbsp_get_rx_delay(unsigned int id)
+{
+       struct omap_mcbsp *mcbsp;
+       u16 buffstat, threshold;
+
+       if (!omap_mcbsp_check_valid_id(id)) {
+               printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+               return -ENODEV;
+       }
+       mcbsp = id_to_mcbsp_ptr(id);
+
+       /* Returns the number of used locations in the buffer */
+       buffstat = MCBSP_READ(mcbsp, RBUFFSTAT);
+       /* RX threshold */
+       threshold = MCBSP_READ(mcbsp, THRSH1);
+
+       /* Return the number of location till we reach the threshold limit */
+       if (threshold <= buffstat)
+               return 0;
+       else
+               return threshold - buffstat;
+}
+EXPORT_SYMBOL(omap_mcbsp_get_rx_delay);
+
 /*
  * omap_mcbsp_get_dma_op_mode just return the current configured
  * operating mode for the mcbsp channel