Blackfin: MPU: support XIP in async flash memory

The NOMPU code already supported executing in the async banks, so this
brings the MPU code in line.
Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/kernel/cplb-mpu/cplbmgr.c

@@ -113,11 +113,11 @@ static noinline int dcplb_miss(unsigned int cpu)
 		addr = L2_START;
 		d_data = L2_DMEMORY;
 	} else if (addr >= physical_mem_end) {
-		if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE
-		    && (status & FAULT_USERSUPV)) {
-			addr &= ~0x3fffff;
+		if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) {
+			addr &= ~(4 * 1024 * 1024 - 1);
 			d_data &= ~PAGE_SIZE_4KB;
 			d_data |= PAGE_SIZE_4MB;
+			d_data |= CPLB_USER_RD | CPLB_USER_WR;
 		} else if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH
 		    && (status & (FAULT_RW | FAULT_USERSUPV)) == FAULT_USERSUPV) {
 			addr &= ~(1 * 1024 * 1024 - 1);
@@ -203,7 +203,12 @@ static noinline int icplb_miss(unsigned int cpu)
 		addr = L2_START;
 		i_data = L2_IMEMORY;
 	} else if (addr >= physical_mem_end) {
-		if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH
+		if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE) {
+			addr &= ~(4 * 1024 * 1024 - 1);
+			i_data &= ~PAGE_SIZE_4KB;
+			i_data |= PAGE_SIZE_4MB;
+			i_data |= CPLB_USER_RD;
+		} else if (addr >= BOOT_ROM_START && addr < BOOT_ROM_START + BOOT_ROM_LENGTH
 		    && (status & FAULT_USERSUPV)) {
 			addr &= ~(1 * 1024 * 1024 - 1);
 			i_data &= ~PAGE_SIZE_4KB;