sh: Add flag for MMU PTEA capability.

Add CPU_HAS_PTEA, refactor some of the cpu flag settings.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4/probe.c

@@ -3,7 +3,7 @@
  *
  * CPU Subtype Probing for SH-4.
  *
- * Copyright (C) 2001, 2002, 2003, 2004  Paul Mundt
+ * Copyright (C) 2001 - 2005  Paul Mundt
  * Copyright (C) 2003  Richard Curnow
  *
  * This file is subject to the terms and conditions of the GNU General Public
@@ -53,9 +53,6 @@ int __init detect_cpu_and_cache_system(void)
 	cpu_data->dcache.ways		= 1;
 	cpu_data->dcache.linesz		= L1_CACHE_BYTES;
 
-	/* Set the FPU flag, virtually all SH-4's have one */
-	cpu_data->flags |= CPU_HAS_FPU;
-
 	/*
 	 * Probe the underlying processor version/revision and
 	 * adjust cpu_data setup accordingly.
@@ -63,26 +60,37 @@ int __init detect_cpu_and_cache_system(void)
 	switch (pvr) {
 	case 0x205:
 		cpu_data->type = CPU_SH7750;
-		cpu_data->flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_PERF_COUNTER;
+		cpu_data->flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
+				   CPU_HAS_PERF_COUNTER | CPU_HAS_PTEA;
 		break;
 	case 0x206:
 		cpu_data->type = CPU_SH7750S;
-		cpu_data->flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_PERF_COUNTER;
+		cpu_data->flags |= CPU_HAS_P2_FLUSH_BUG | CPU_HAS_FPU |
+				   CPU_HAS_PERF_COUNTER | CPU_HAS_PTEA;
 		break;
 	case 0x1100:
 		cpu_data->type = CPU_SH7751;
+		cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PTEA;
 		break;
 	case 0x2000:
 		cpu_data->type = CPU_SH73180;
 		cpu_data->icache.ways = 4;
 		cpu_data->dcache.ways = 4;
-		cpu_data->flags &= ~CPU_HAS_FPU;
+
+		/*
+		 * XXX: Double check this, none of the SH-4A/SH-4AL processors
+		 * should have this, as it's essentially a legacy thing.
+		 */
+		cpu_data->flags |= CPU_HAS_PTEA;
 		break;
 	case 0x2001:
 	case 0x2004:
 		cpu_data->type = CPU_SH7770;
 		cpu_data->icache.ways = 4;
 		cpu_data->dcache.ways = 4;
+
+		/* Same note as above applies here for PTEA */
+		cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PTEA;
 		break;
 	case 0x2006:
 	case 0x200A:
@@ -90,27 +98,31 @@ int __init detect_cpu_and_cache_system(void)
 			cpu_data->type = CPU_SH7781;
 		else
 			cpu_data->type = CPU_SH7780;
+
 		cpu_data->icache.ways = 4;
 		cpu_data->dcache.ways = 4;
+
+		cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PERF_COUNTER;
 		break;
 	case 0x8000:
 		cpu_data->type = CPU_ST40RA;
+		cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PTEA;
 		break;
 	case 0x8100:
 		cpu_data->type = CPU_ST40GX1;
+		cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PTEA;
 		break;
 	case 0x700:
 		cpu_data->type = CPU_SH4_501;
 		cpu_data->icache.ways = 2;
 		cpu_data->dcache.ways = 2;
-
-		/* No FPU on the SH4-500 series.. */
-		cpu_data->flags &= ~CPU_HAS_FPU;
+		cpu_data->flags |= CPU_HAS_PTEA;
 		break;
 	case 0x600:
 		cpu_data->type = CPU_SH4_202;
 		cpu_data->icache.ways = 2;
 		cpu_data->dcache.ways = 2;
+		cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PTEA;
 		break;
 	case 0x500 ... 0x501:
 		switch (prr) {
@@ -128,6 +140,8 @@ int __init detect_cpu_and_cache_system(void)
 		cpu_data->icache.ways = 2;
 		cpu_data->dcache.ways = 2;
 
+		cpu_data->flags |= CPU_HAS_FPU | CPU_HAS_PTEA;
+
 		break;
 	default:
 		cpu_data->type = CPU_SH_NONE;

arch/sh/kernel/cpu/sh4/sq.c

@@ -166,9 +166,9 @@ static struct sq_mapping *__sq_remap(struct sq_mapping *map)
 	ctrl_outl((pteh & MMU_VPN_MASK) | get_asid(), MMU_PTEH);
 
 	ptel = map->addr & PAGE_MASK;
-#ifndef CONFIG_CPU_SUBTYPE_SH7780
-	ctrl_outl(((ptel >> 28) & 0xe) | (ptel & 0x1), MMU_PTEA);
-#endif
+
+	if (cpu_data->flags & CPU_HAS_PTEA)
+		ctrl_outl(((ptel >> 28) & 0xe) | (ptel & 0x1), MMU_PTEA);
 
 	pgprot = pgprot_noncached(PAGE_KERNEL);
 

arch/sh/mm/tlb-sh4.c

@@ -36,9 +36,6 @@ void update_mmu_cache(struct vm_area_struct * vma,
 	unsigned long vpn;
 	struct page *page;
 	unsigned long pfn;
-#ifndef CONFIG_CPU_SUBTYPE_SH7780
-	unsigned long ptea;
-#endif
 
 	/* Ptrace may call this routine. */
 	if (vma && current->active_mm != vma->vm_mm)
@@ -61,12 +58,11 @@ void update_mmu_cache(struct vm_area_struct * vma,
 	ctrl_outl(vpn, MMU_PTEH);
 
 	pteval = pte_val(pte);
-#ifndef CONFIG_CPU_SUBTYPE_SH7780
+
 	/* Set PTEA register */
-	/* TODO: make this look less hacky */
-	ptea = ((pteval >> 28) & 0xe) | (pteval & 0x1);
-	ctrl_outl(ptea, MMU_PTEA);
-#endif
+	if (cpu_data->flags & CPU_HAS_PTEA)
+		/* TODO: make this look less hacky */
+		ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA);
 
 	/* Set PTEL register */
 	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */