From c3284d622762eb008bc52d0c2c6e4953fe0bebe5 Mon Sep 17 00:00:00 2001
From: "Suren A. Chilingaryan" <csa@suren.me>
Date: Wed, 13 May 2015 04:50:26 +0200
Subject: Support streaming mode DMA

---
 CMakeLists.txt |  2 ++
 ipedma_test.c  | 28 +++++++++++++++++++++++++---
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index eb1b766..4721538 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,6 +14,8 @@ link_directories(
     ${PCILIB_LIBRARY_DIRS}
 )
 
+add_definitions("-fPIC --std=c99 -O2 -gdwarf-2 -g3")
+
 add_executable(ipedma_test ipedma_test.c)
 target_link_libraries(ipedma_test ${PCILIB_LIBRARIES})
 set_target_properties(ipedma_test PROPERTIES COMPILE_FLAGS -Wno-array-bounds)
diff --git a/ipedma_test.c b/ipedma_test.c
index a99a40b..d072a5c 100644
--- a/ipedma_test.c
+++ b/ipedma_test.c
@@ -15,6 +15,7 @@
 
 #include <pcilib.h>
 #include <pcilib/kmem.h>
+#include <pcilib/bar.h>
 
 //#include <sys/ipc.h>
 //#include <sys/shm.h>
@@ -29,14 +30,16 @@
 
 #define BUFFERS         128
 #define ITERATIONS      1000
-#define DESC_THRESHOLD  BUFFERS/8   // Lorenzo: after how many desc the FPGA must update the "written descriptor counter" in PC mem
+#define DESC_THRESHOLD  1//BUFFERS/8   // Lorenzo: after how many desc the FPGA must update the "written descriptor counter" in PC mem
                                     // if set to 0, the update only happens when INT is received
 
 #define HUGE_PAGE       1           // number of pages per huge page
-#define TLP_SIZE        32          // TLP SIZE = 64 for 256B payload, 32 for 128B payload
+#define TLP_SIZE        64          // TLP SIZE = 64 for 256B payload, 32 for 128B payload
 #define PAGE_SIZE       4096        // other values are not supported in the kernel
 
 #define USE_64                      // Lorenzo: use 64bit addressing
+#define USE_STREAMING               // Use alternative implementation with streaming sequence of memory pages
+#define ENABLE_COUNTER  0x9000      // If set wee need to write 1 to the specified register to enable counter
 
 //#define DUAL_CORE                 // Lorenzo: DUAL Core
 
@@ -405,8 +408,16 @@ int main() {
 
     printf("* DMA: Start \n");
     WR(0x04, 0x1);
+
+#ifdef ENABLE_COUNTER
+    printf("* Enable counter\n");
+    WR(ENABLE_COUNTER, 0x1);
+#endif /* ENABLE_COUNTER */
+
     gettimeofday(&start, NULL);
 
+
+
     // ******************************************************************
     // ****     Handshaking DMA                                     *****
     // ******************************************************************
@@ -438,7 +449,7 @@ int main() {
                 hwptr = desc[4];
 #endif
         j++;    
-        //printf("\rcurptr: %lx \t \t hwptr: %lx", curptr, hwptr);
+	    //printf("curptr: %lx \t \t hwptr: %lx\n", curptr, hwptr);
         } while (hwptr == curptr);
 
         do {    
@@ -446,6 +457,12 @@ int main() {
 #ifdef MEM_COPY   
             memcpy(temp_data[i][curbuf], (void*)ptr[curbuf], 4096);
 #endif
+
+#ifdef USE_STREAMING
+	    WR(0x50, bus_addr[curbuf]);
+	    // Now, we can check error in the register 0x68 (non-zero if there is an error)
+#endif /* USE_STREAMING */
+
 #ifdef CHECK_RESULTS
 for (k = 0; k < 1024 ; k++) 
             {
@@ -501,7 +518,12 @@ for (k = 0; k < 1024 ; k++)
         }
 #endif  
 
+#ifndef USE_STREAMING
+	    // Generally it is safe to write register in any case, it is just unsed in streaming mode
+	    // Therefore, in the driver we can use it instead of software register so far
         WR(0x58, curbuf + 1); 
+#endif /* ! USE_STREAMING */
+        
         //printf("WR %d\n", curbuf + 1); 
         //printf("%u (%lu)\n", curbuf, j);
         curptr = hwptr;
-- 
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