[POWERPC] bestcomm: Restrict bus prefetch bugfix to original mpc5200 silicon.

Only the MPC5200 needs this bug fix.  MPC5200B is okay.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 11 insertions, 3 deletions

diff --git a/arch/powerpc/sysdev/bestcomm/bestcomm.c b/arch/powerpc/sysdev/bestcomm/bestcomm.c
index 48492a83e5a7..740ad73ce5cc 100644
--- a/arch/powerpc/sysdev/bestcomm/bestcomm.c
+++ b/arch/powerpc/sysdev/bestcomm/bestcomm.c
@@ -269,6 +269,7 @@ bcom_engine_init(void)
         int task;
         phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
         unsigned int tdt_size, ctx_size, var_size, fdt_size;
+        u16 regval;
 
         /* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
         tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
@@ -319,9 +320,11 @@ bcom_engine_init(void)
         /* Init 'always' initiator */
         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
 
-        /* Disable COMM Bus Prefetch, apparently it's not reliable yet */
-        /* FIXME: This should be done on 5200 and not 5200B ... */
-        out_be16(&bcom_eng->regs->PtdCntrl, in_be16(&bcom_eng->regs->PtdCntrl) | 1);
+        /* Disable COMM Bus Prefetch on the original 5200; it's broken */
+        if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR) {
+                regval = in_be16(&bcom_eng->regs->PtdCntrl);
+                out_be16(&bcom_eng->regs->PtdCntrl,  regval | 1);
+        }
 
         /* Init lock */
         spin_lock_init(&bcom_eng->lock);
diff --git a/include/asm-powerpc/mpc52xx.h b/include/asm-powerpc/mpc52xx.h
index 568135fe52ea..764d997b4cde 100644
--- a/include/asm-powerpc/mpc52xx.h
+++ b/include/asm-powerpc/mpc52xx.h
@@ -20,6 +20,11 @@
 
 #include <linux/suspend.h>
 
+/* Variants of the 5200(B) */
+#define MPC5200_SVR             0x80110010
+#define MPC5200_SVR_MASK        0xfffffff0
+#define MPC5200B_SVR            0x80110020
+#define MPC5200B_SVR_MASK       0xfffffff0
 
 /* ======================================================================== */
 /* Structures mapping of some unit register set                             */