OMAP: McBSP: APIs to pass DMA params from McBSP driver to client drivers
Kishon Vijay Abraham I [Thu, 24 Feb 2011 09:46:55 +0000 (14:46 +0530)]
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>

arch/arm/mach-omap2/mcbsp.c
arch/arm/plat-omap/include/plat/mcbsp.h
arch/arm/plat-omap/mcbsp.c

index 4ada6a9..565b906 100644 (file)
@@ -126,6 +126,8 @@ static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
                return -ENOMEM;
        }
 
+       pdata->mcbsp_config_type = oh->class->rev;
+
        if (oh->class->rev == MCBSP_CONFIG_TYPE3) {
                if (id == 2)
                        /* The FIFO has 1024 + 256 locations */
index 964a940..21c9b10 100644 (file)
@@ -81,6 +81,8 @@ static struct platform_device omap_mcbsp##port_nr = { \
 #define OMAP_MCBSP_REG_DRR1    0x02
 #define OMAP_MCBSP_REG_DXR2    0x04
 #define OMAP_MCBSP_REG_DXR1    0x06
+#define OMAP_MCBSP_REG_DRR     0x02
+#define OMAP_MCBSP_REG_DXR     0x06
 #define OMAP_MCBSP_REG_SPCR2   0x08
 #define OMAP_MCBSP_REG_SPCR1   0x0a
 #define OMAP_MCBSP_REG_RCR2    0x0c
@@ -423,6 +425,7 @@ struct omap_mcbsp_platform_data {
        unsigned long phys_base_st;
 #endif
        u16 buffer_size;
+       unsigned int mcbsp_config_type;
 };
 
 struct omap_mcbsp_st_data {
@@ -473,6 +476,7 @@ struct omap_mcbsp {
        u16 max_rx_thres;
 #endif
        void *reg_cache;
+       unsigned int mcbsp_config_type;
 };
 
 /**
@@ -541,6 +545,9 @@ int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type);
 void omap2_mcbsp1_mux_clkr_src(u8 mux);
 void omap2_mcbsp1_mux_fsr_src(u8 mux);
 
+int omap_mcbsp_dma_ch_params(unsigned int id, unsigned int stream);
+int omap_mcbsp_dma_reg_params(unsigned int id, unsigned int stream);
+
 #ifdef CONFIG_ARCH_OMAP3
 /* Sidetone specific API */
 int omap_st_set_chgain(unsigned int id, int channel, s16 chgain);
index 6d23016..d598d9f 100644 (file)
@@ -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);