OMAP: McBSP: APIs to pass DMA params from McBSP driver to client drivers

After McBSP driver is hwmod adapted, the information about the hw would be
obtained from the hwmod database by the mcbsp driver. Since DMA programming is
handled by the client driver, APIs are provided to pass the DMA channel number
and base address of data register required by the client driver for DMA
programming.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Charulatha V <charu@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 6d230164b4f9..d598d9fd65ac 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -229,6 +229,69 @@ void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
 }
 EXPORT_SYMBOL(omap_mcbsp_config);
 
+/**
+ * omap_mcbsp_dma_params - returns the dma channel number
+ * @id - mcbsp id
+ * @stream - indicates the direction of data flow (rx or tx)
+ *
+ * Returns the dma channel number for the rx channel or tx channel
+ * based on the value of @stream for the requested mcbsp given by @id
+ */
+int omap_mcbsp_dma_ch_params(unsigned int id, unsigned int stream)
+{
+        struct omap_mcbsp *mcbsp;
+
+        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);
+
+        if (stream)
+                return mcbsp->dma_rx_sync;
+        else
+                return mcbsp->dma_tx_sync;
+}
+EXPORT_SYMBOL(omap_mcbsp_dma_ch_params);
+
+/**
+ * omap_mcbsp_dma_reg_params - returns the address of mcbsp data register
+ * @id - mcbsp id
+ * @stream - indicates the direction of data flow (rx or tx)
+ *
+ * Returns the address of mcbsp data transmit register or data receive register
+ * to be used by DMA for transferring/receiving data based on the value of
+ * @stream for the requested mcbsp given by @id
+ */
+int omap_mcbsp_dma_reg_params(unsigned int id, unsigned int stream)
+{
+        struct omap_mcbsp *mcbsp;
+        int data_reg;
+
+        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);
+
+        data_reg = mcbsp->phys_dma_base;
+
+        if (mcbsp->mcbsp_config_type < MCBSP_CONFIG_TYPE2) {
+                if (stream)
+                        data_reg += OMAP_MCBSP_REG_DRR1;
+                else
+                        data_reg += OMAP_MCBSP_REG_DXR1;
+        } else {
+                if (stream)
+                        data_reg += OMAP_MCBSP_REG_DRR;
+                else
+                        data_reg += OMAP_MCBSP_REG_DXR;
+        }
+
+        return data_reg;
+}
+EXPORT_SYMBOL(omap_mcbsp_dma_reg_params);
+
 #ifdef CONFIG_ARCH_OMAP3
 static struct omap_device *find_omap_device_by_dev(struct device *dev)
 {
@@ -1835,6 +1898,7 @@ static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
         mcbsp->pdata = pdata;
         mcbsp->dev = &pdev->dev;
         mcbsp_ptr[id] = mcbsp;
+        mcbsp->mcbsp_config_type = pdata->mcbsp_config_type;
         platform_set_drvdata(pdev, mcbsp);
         pm_runtime_enable(mcbsp->dev);