powerpc/e500mc: flush L2 on NAP for e500mc

If we have an L2CSR register (e500mc) we need to flush the L2 before going
to nap.  We use the HW flush mechanism provided in that register.

The code reuses the CPU_FTR_604_PERF_MON bit as it is no longer used by
any code in the kernel.  Additionally we didn't reuse the exist L2CR
feature bit as this is intended for the 7xxx L2CR register and L2CSR
is part of the new Freescale "Book-E" registers.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2 files changed, 21 insertions, 4 deletions

diff --git a/include/asm-powerpc/cputable.h b/include/asm-powerpc/cputable.h
index 18feb63dd3c0..9106113ae0b5 100644
--- a/include/asm-powerpc/cputable.h
+++ b/include/asm-powerpc/cputable.h
@@ -132,7 +132,7 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
 #define CPU_FTR_TAU                     ASM_CONST(0x0000000000000010)
 #define CPU_FTR_CAN_DOZE                ASM_CONST(0x0000000000000020)
 #define CPU_FTR_USE_TB                  ASM_CONST(0x0000000000000040)
-#define CPU_FTR_604_PERF_MON            ASM_CONST(0x0000000000000080)
+#define CPU_FTR_L2CSR                   ASM_CONST(0x0000000000000080)
 #define CPU_FTR_601                     ASM_CONST(0x0000000000000100)
 #define CPU_FTR_HPTE_TABLE              ASM_CONST(0x0000000000000200)
 #define CPU_FTR_CAN_NAP                 ASM_CONST(0x0000000000000400)
@@ -245,8 +245,7 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
             CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | \
             CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_PPC_LE)
 #define CPU_FTRS_604    (CPU_FTR_COMMON | \
-            CPU_FTR_USE_TB | CPU_FTR_604_PERF_MON | CPU_FTR_HPTE_TABLE | \
-            CPU_FTR_PPC_LE)
+            CPU_FTR_USE_TB | CPU_FTR_HPTE_TABLE | CPU_FTR_PPC_LE)
 #define CPU_FTRS_740_NOTAU      (CPU_FTR_COMMON | \
             CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | CPU_FTR_L2CR | \
             CPU_FTR_HPTE_TABLE | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_PPC_LE)
@@ -353,7 +352,8 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
             CPU_FTR_SPE_COMP | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_BIG_PHYS | \
             CPU_FTR_NODSISRALIGN)
 #define CPU_FTRS_E500MC (CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | \
-            CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_BIG_PHYS | CPU_FTR_NODSISRALIGN)
+            CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_BIG_PHYS | CPU_FTR_NODSISRALIGN | \
+            CPU_FTR_L2CSR)
 #define CPU_FTRS_GENERIC_32     (CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN)
 
 /* 64-bit CPUs */
diff --git a/include/asm-powerpc/reg_booke.h b/include/asm-powerpc/reg_booke.h
index a5e8903bbc87..be980f4ee495 100644
--- a/include/asm-powerpc/reg_booke.h
+++ b/include/asm-powerpc/reg_booke.h
@@ -80,6 +80,7 @@
 #define SPRN_DSRR1      0x23F   /* Debug Save and Restore Register 1 */
 #define SPRN_SPRG8      0x25C   /* Special Purpose Register General 8 */
 #define SPRN_SPRG9      0x25D   /* Special Purpose Register General 9 */
+#define SPRN_L1CSR2     0x25E   /* L1 Cache Control and Status Register 2 */
 #define SPRN_MAS0       0x270   /* MMU Assist Register 0 */
 #define SPRN_MAS1       0x271   /* MMU Assist Register 1 */
 #define SPRN_MAS2       0x272   /* MMU Assist Register 2 */
@@ -110,6 +111,8 @@
 #define SPRN_L1CSR1     0x3F3   /* L1 Cache Control and Status Register 1 */
 #define SPRN_PIT        0x3DB   /* Programmable Interval Timer */
 #define SPRN_BUCSR      0x3F5   /* Branch Unit Control and Status */
+#define SPRN_L2CSR0     0x3F9   /* L2 Data Cache Control and Status Register 0 */
+#define SPRN_L2CSR1     0x3FA   /* L2 Data Cache Control and Status Register 1 */
 #define SPRN_DCCR       0x3FA   /* Data Cache Cacheability Register */
 #define SPRN_ICCR       0x3FB   /* Instruction Cache Cacheability Register */
 #define SPRN_SVR        0x3FF   /* System Version Register */
@@ -393,6 +396,20 @@
 #define L1CSR1_ICFI     0x00000002      /* Instr Cache Flash Invalidate */
 #define L1CSR1_ICE      0x00000001      /* Instr Cache Enable */
 
+/* Bit definitions for L2CSR0. */
+#define L2CSR0_L2E      0x80000000      /* L2 Cache Enable */
+#define L2CSR0_L2PE     0x40000000      /* L2 Cache Parity/ECC Enable */
+#define L2CSR0_L2WP     0x1c000000      /* L2 I/D Way Partioning */
+#define L2CSR0_L2CM     0x03000000      /* L2 Cache Coherency Mode */
+#define L2CSR0_L2FI     0x00200000      /* L2 Cache Flash Invalidate */
+#define L2CSR0_L2IO     0x00100000      /* L2 Cache Instruction Only */
+#define L2CSR0_L2DO     0x00010000      /* L2 Cache Data Only */
+#define L2CSR0_L2REP    0x00003000      /* L2 Line Replacement Algo */
+#define L2CSR0_L2FL     0x00000800      /* L2 Cache Flush */
+#define L2CSR0_L2LFC    0x00000400      /* L2 Cache Lock Flash Clear */
+#define L2CSR0_L2LOA    0x00000080      /* L2 Cache Lock Overflow Allocate */
+#define L2CSR0_L2LO     0x00000020      /* L2 Cache Lock Overflow */
+
 /* Bit definitions for SGR. */
 #define SGR_NORMAL      0               /* Speculative fetching allowed. */
 #define SGR_GUARDED     1               /* Speculative fetching disallowed. */