Blackfin arch: bug fixing restore mach dependent ASYNC memory size

Bug: When SMC921X driver is enabled, kernel boot crash on EZKIT548
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3460

Fixed by restoring mach dependent ASYNC memory size CPLB coverage.
Once we have a more dynamic memory layout we should come up with a better
solution for these hard-coded values.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

include/asm-blackfin/cplb.h

@@ -65,27 +65,33 @@
 
 #define MAX_CPLBS (16 * 2)
 
+#define ASYNC_MEMORY_CPLB_COVERAGE	((ASYNC_BANK0_SIZE + ASYNC_BANK1_SIZE + \
+				 ASYNC_BANK2_SIZE + ASYNC_BANK3_SIZE) / SIZE_4M)
+
 /*
 * Number of required data CPLB switchtable entries
 * MEMSIZE / 4 (we mostly install 4M page size CPLBs
 * approx 16 for smaller 1MB page size CPLBs for allignment purposes
 * 1 for L1 Data Memory
+* possibly 1 for L2 Data Memory
 * 1 for CONFIG_DEBUG_HUNT_FOR_ZERO
 * 1 for ASYNC Memory
 */
 
 
-#define MAX_SWITCH_D_CPLBS (((CONFIG_MEM_SIZE / 4) + 16 + 1 + 1 + 1) * 2)
+#define MAX_SWITCH_D_CPLBS (((CONFIG_MEM_SIZE / 4) + 16 + 1 + 1 + 1 \
+				 + ASYNC_MEMORY_CPLB_COVERAGE) * 2)
 
 /*
 * Number of required instruction CPLB switchtable entries
 * MEMSIZE / 4 (we mostly install 4M page size CPLBs
 * approx 12 for smaller 1MB page size CPLBs for allignment purposes
 * 1 for L1 Instruction Memory
+* possibly 1 for L2 Instruction Memory
 * 1 for CONFIG_DEBUG_HUNT_FOR_ZERO
 */
 
-#define MAX_SWITCH_I_CPLBS (((CONFIG_MEM_SIZE / 4) + 12 + 1 + 1) * 2)
+#define MAX_SWITCH_I_CPLBS (((CONFIG_MEM_SIZE / 4) + 12 + 1 + 1 + 1) * 2)
 
 
 #define CPLB_ENABLE_ICACHE_P	0