Blackfin: handle BF561 Core B memory regions better when SMP=n

Rather than assume Core B is always run with caches turned on, let people
load into any of the on-chip memory regions.  It is their business how the
SRAM/Cache regions are utilized, so don't prevent them from being able to
load into them.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2 files changed, 29 insertions, 8 deletions

diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index 79cad0ac5892..9da36bab7ccb 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -361,7 +361,7 @@ static inline
 int in_mem_const(unsigned long addr, unsigned long size,
                  unsigned long const_addr, unsigned long const_size)
 {
-        return in_mem_const_off(addr, 0, size, const_addr, const_size);
+        return in_mem_const_off(addr, size, 0, const_addr, const_size);
 }
 #define IN_ASYNC(bnum, bctlnum) \
 ({ \
@@ -390,13 +390,13 @@ int bfin_mem_access_type(unsigned long addr, unsigned long size)
         if (in_mem_const(addr, size, L1_DATA_B_START, L1_DATA_B_LENGTH))
                 return cpu == 0 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
 #ifdef COREB_L1_CODE_START
-        if (in_mem_const(addr, size, COREB_L1_CODE_START, L1_CODE_LENGTH))
+        if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))
                 return cpu == 1 ? BFIN_MEM_ACCESS_ITEST : BFIN_MEM_ACCESS_IDMA;
         if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
                 return cpu == 1 ? BFIN_MEM_ACCESS_CORE_ONLY : -EFAULT;
-        if (in_mem_const(addr, size, COREB_L1_DATA_A_START, L1_DATA_A_LENGTH))
+        if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))
                 return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
-        if (in_mem_const(addr, size, COREB_L1_DATA_B_START, L1_DATA_B_LENGTH))
+        if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))
                 return cpu == 1 ? BFIN_MEM_ACCESS_CORE : BFIN_MEM_ACCESS_IDMA;
 #endif
         if (in_mem_const(addr, size, L2_START, L2_LENGTH))
@@ -472,13 +472,13 @@ int _access_ok(unsigned long addr, unsigned long size)
         if (in_mem_const_off(addr, size, _ebss_b_l1 - _sdata_b_l1, L1_DATA_B_START, L1_DATA_B_LENGTH))
                 return 1;
 #ifdef COREB_L1_CODE_START
-        if (in_mem_const(addr, size, COREB_L1_CODE_START, L1_CODE_LENGTH))
+        if (in_mem_const(addr, size, COREB_L1_CODE_START, COREB_L1_CODE_LENGTH))
                 return 1;
         if (in_mem_const(addr, size, COREB_L1_SCRATCH_START, L1_SCRATCH_LENGTH))
                 return 1;
-        if (in_mem_const(addr, size, COREB_L1_DATA_A_START, L1_DATA_A_LENGTH))
+        if (in_mem_const(addr, size, COREB_L1_DATA_A_START, COREB_L1_DATA_A_LENGTH))
                 return 1;
-        if (in_mem_const(addr, size, COREB_L1_DATA_B_START, L1_DATA_B_LENGTH))
+        if (in_mem_const(addr, size, COREB_L1_DATA_B_START, COREB_L1_DATA_B_LENGTH))
                 return 1;
 #endif
         if (in_mem_const_off(addr, size, _ebss_l2 - _stext_l2, L2_START, L2_LENGTH))
diff --git a/arch/blackfin/mach-bf561/include/mach/mem_map.h b/arch/blackfin/mach-bf561/include/mach/mem_map.h
index a63e15c86d90..5b96ea549a04 100644
--- a/arch/blackfin/mach-bf561/include/mach/mem_map.h
+++ b/arch/blackfin/mach-bf561/include/mach/mem_map.h
@@ -37,7 +37,6 @@
 
 /* Memory Map for ADSP-BF561 processors */
 
-#ifdef CONFIG_BF561
 #define COREA_L1_CODE_START       0xFFA00000
 #define COREA_L1_DATA_A_START     0xFF800000
 #define COREA_L1_DATA_B_START     0xFF900000
@@ -74,6 +73,28 @@
 #define BFIN_DCACHESIZE (0*1024)
 #define BFIN_DSUPBANKS  0
 #endif /*CONFIG_BFIN_DCACHE*/
+
+/*
+ * If we are in SMP mode, then the cache settings of Core B will match
+ * the settings of Core A.  If we aren't, then we assume Core B is not
+ * using any cache.  This allows the rest of the kernel to work with
+ * the core in either mode as we are only loading user code into it and
+ * it is the user's problem to make sure they aren't doing something
+ * stupid there.
+ *
+ * Note that we treat the L1 code region as a contiguous blob to make
+ * the rest of the kernel simpler.  Easier to check one region than a
+ * bunch of small ones.  Again, possible misbehavior here is the fault
+ * of the user -- don't try to use memory that doesn't exist.
+ */
+#ifdef CONFIG_SMP
+# define COREB_L1_CODE_LENGTH     L1_CODE_LENGTH
+# define COREB_L1_DATA_A_LENGTH   L1_DATA_A_LENGTH
+# define COREB_L1_DATA_B_LENGTH   L1_DATA_B_LENGTH
+#else
+# define COREB_L1_CODE_LENGTH     0x14000
+# define COREB_L1_DATA_A_LENGTH   0x8000
+# define COREB_L1_DATA_B_LENGTH   0x8000
 #endif
 
 /* Level 2 Memory */