updates

pcie_driver/drexchar.h

@@ -0,0 +1,48 @@
+
+#ifndef DREXCHAR_H
+#define DREXCHAR_H
+
+#include "drex.h"
+
+#define DREXDMA_DMA_INIT             0
+#define DREXDMA_DMA_CLEAR            1
+#define DREXDMA_DMA_START            2
+#define DREXDMA_DMA_STOP             3
+#define DREXDMA_SET_NUM_BUFS         4
+#define DREXDMA_SET_NUM_BYTES        5
+#define DREXDMA_GET_NUM_BUFS         6
+#define DREXDMA_GET_NUM_BYTES        7
+#define DREXDMA_GET_FREE_BUFS        8
+
+
+typedef struct {
+   unsigned int cmd;
+   unsigned int offset;
+   unsigned int value;
+} drexpcie_ioctl_t;  
+
+
+struct drexpcie_device_priv {
+	uint8_t chnum;
+	struct drexpcie_driver_priv* driv_priv;
+   
+   uint32_t type;
+   u8 __iomem *base_mem;
+
+   // Parameters used to allocate dma buffers
+   uint32_t num_bufs;
+   uint32_t valid_bufs;
+   uint32_t num_bytes;
+
+   // Physical memory address returned by dma_alloc_coherent
+   dma_addr_t *dmaPtr;
+                    
+   // Virtual memory address returned by dma_alloc_coherent
+   void  **bufPtr;
+
+};
+
+int drexpcie_chardev_create(struct drexpcie_driver_priv *driv_priv);
+int drexpcie_chardev_destroy(void);
+
+#endif