powerpc/booke: Add support for new e500mc core

The new e500mc core from Freescale is based on the e500v2 but with the
following changes:

* Supports only the Enhanced Debug Architecture (DSRR0/1, etc)
* Floating Point
* No SPE
* Supports lwsync
* Doorbell Exceptions
* Hypervisor
* Cache line size is now 64-bytes (e500v1/v2 have a 32-byte cache line)
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/kernel/cputable.c

@@ -1522,6 +1522,21 @@ static struct cpu_spec __initdata cpu_specs[] = {
 		.machine_check		= machine_check_e500,
 		.platform		= "ppc8548",
 	},
+	{	/* e500mc */
+		.pvr_mask		= 0xffff0000,
+		.pvr_value		= 0x80230000,
+		.cpu_name		= "e500mc",
+		/* xxx - galak: add CPU_FTR_MAYBE_CAN_DOZE */
+		.cpu_features		= CPU_FTRS_E500MC,
+		.cpu_user_features	= COMMON_USER_BOOKE | PPC_FEATURE_HAS_FPU,
+		.icache_bsize		= 64,
+		.dcache_bsize		= 64,
+		.num_pmcs		= 4,
+		.oprofile_cpu_type	= "ppc/e500", /* xxx - galak, e500mc? */
+		.oprofile_type		= PPC_OPROFILE_FSL_EMB,
+		.machine_check		= machine_check_e500,
+		.platform		= "ppce500mc",
+	},
 	{	/* default match */
 		.pvr_mask		= 0x00000000,
 		.pvr_value		= 0x00000000,

arch/powerpc/kernel/head_booke.h

@@ -68,9 +68,13 @@
 #define MCHECK_STACK_BASE	mcheckirq_ctx
 #define CRIT_STACK_BASE		critirq_ctx
 
-/* only on e200 for now */
+/* only on e500mc/e200 */
 #define DEBUG_STACK_BASE	dbgirq_ctx
+#ifdef CONFIG_PPC_E500MC
+#define DEBUG_SPRG		SPRN_SPRG9
+#else
 #define DEBUG_SPRG		SPRN_SPRG6W
+#endif
 
 #define EXC_LVL_FRAME_OVERHEAD	(THREAD_SIZE - INT_FRAME_SIZE - EXC_LVL_SIZE)
 

arch/powerpc/kernel/head_fsl_booke.S

@@ -304,7 +304,7 @@ skpinv:	addi	r6,r6,1				/* Increment */
 	SET_IVOR(13, DataTLBError);
 	SET_IVOR(14, InstructionTLBError);
 	SET_IVOR(15, DebugDebug);
-#if defined(CONFIG_E500)
+#if defined(CONFIG_E500) && !defined(CONFIG_PPC_E500MC)
 	SET_IVOR(15, DebugCrit);
 #endif
 	SET_IVOR(32, SPEUnavailable);
@@ -313,6 +313,9 @@ skpinv:	addi	r6,r6,1				/* Increment */
 #ifndef CONFIG_E200
 	SET_IVOR(35, PerformanceMonitor);
 #endif
+#ifdef CONFIG_PPC_E500MC
+	SET_IVOR(36, Doorbell);
+#endif
 
 	/* Establish the interrupt vector base */
 	lis	r4,interrupt_base@h	/* IVPR only uses the high 16-bits */
@@ -750,10 +753,13 @@ interrupt_base:
 	/* Performance Monitor */
 	EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
 
+#ifdef CONFIG_PPC_E500MC
+	EXCEPTION(0x2070, Doorbell, unknown_exception, EXC_XFER_EE)
+#endif
 
 	/* Debug Interrupt */
 	DEBUG_DEBUG_EXCEPTION
-#if defined(CONFIG_E500)
+#if defined(CONFIG_E500) && !defined(CONFIG_PPC_E500MC)
 	DEBUG_CRIT_EXCEPTION
 #endif
 

arch/powerpc/platforms/Kconfig.cputype

@@ -95,6 +95,11 @@ config E500
 	select FSL_EMB_PERFMON
 	bool
 
+config PPC_E500MC
+	bool "e500mc Support"
+	select PPC_FPU
+	depends on E500
+
 config PPC_FPU
 	bool
 	default y if PPC64
@@ -157,7 +162,7 @@ config ALTIVEC
 
 config SPE
 	bool "SPE Support"
-	depends on E200 || E500
+	depends on E200 || (E500 && !PPC_E500MC)
 	default y
 	---help---
 	  This option enables kernel support for the Signal Processing

include/asm-powerpc/cache.h

@@ -8,6 +8,9 @@
 #if defined(CONFIG_8xx) || defined(CONFIG_403GCX)
 #define L1_CACHE_SHIFT		4
 #define MAX_COPY_PREFETCH	1
+#elif defined(CONFIG_PPC_E500MC)
+#define L1_CACHE_SHIFT		6
+#define MAX_COPY_PREFETCH	4
 #elif defined(CONFIG_PPC32)
 #define L1_CACHE_SHIFT		5
 #define MAX_COPY_PREFETCH	4

include/asm-powerpc/cputable.h

@@ -351,6 +351,8 @@ extern void do_feature_fixups(unsigned long value, void *fixup_start,
 	    CPU_FTR_NODSISRALIGN)
 #define CPU_FTRS_E500_2	(CPU_FTR_USE_TB | CPU_FTR_SPE_COMP | \
 	    CPU_FTR_BIG_PHYS | CPU_FTR_NODSISRALIGN)
+#define CPU_FTRS_E500MC	(CPU_FTR_USE_TB | CPU_FTR_BIG_PHYS | \
+	    CPU_FTR_NODSISRALIGN)
 #define CPU_FTRS_GENERIC_32	(CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN)
 
 /* 64-bit CPUs */
@@ -421,7 +423,7 @@ enum {
 	    CPU_FTRS_E200 |
 #endif
 #ifdef CONFIG_E500
-	    CPU_FTRS_E500 | CPU_FTRS_E500_2 |
+	    CPU_FTRS_E500 | CPU_FTRS_E500_2 | CPU_FTRS_E500MC |
 #endif
 	    0,
 };
@@ -461,7 +463,7 @@ enum {
 	    CPU_FTRS_E200 &
 #endif
 #ifdef CONFIG_E500
-	    CPU_FTRS_E500 & CPU_FTRS_E500_2 &
+	    CPU_FTRS_E500 & CPU_FTRS_E500_2 & CPU_FTRS_E500MC &
 #endif
 	    CPU_FTRS_POSSIBLE,
 };

include/asm-powerpc/synch.h

@@ -4,7 +4,7 @@
 
 #include <linux/stringify.h>
 
-#ifdef __powerpc64__
+#if defined(__powerpc64__) || defined(CONFIG_PPC_E500MC)
 #define __SUBARCH_HAS_LWSYNC
 #endif