Merge branch 'master' into sh/smp

Conflicts:
	arch/sh/mm/cache-sh4.c

4 files changed, 71 insertions, 27 deletions

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 2795618e4f0..64dc1ad5980 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -82,7 +82,7 @@ config 32BIT
 
 config PMB_ENABLE
 	bool "Support 32-bit physical addressing through PMB"
-	depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
+	depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7757 || CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
 	select 32BIT
 	default y
 	help
@@ -97,7 +97,7 @@ choice
 
 config PMB
 	bool "PMB"
-	depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
+	depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7757 || CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
 	select 32BIT
 	help
 	  If you say Y here, physical addressing will be extended to
@@ -106,7 +106,8 @@ config PMB
 
 config PMB_FIXED
 	bool "fixed PMB"
-	depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || \
+	depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7757 || \
+					   CPU_SUBTYPE_SH7780 || \
 					   CPU_SUBTYPE_SH7785)
 	select 32BIT
 	help
diff --git a/arch/sh/mm/cache-sh4.c b/arch/sh/mm/cache-sh4.c
index 2775f84d9aa..70fb906419d 100644
--- a/arch/sh/mm/cache-sh4.c
+++ b/arch/sh/mm/cache-sh4.c
@@ -455,7 +455,49 @@ static void __flush_cache_4096(unsigned long addr, unsigned long phys,
  * Break the 1, 2 and 4 way variants of this out into separate functions to
  * avoid nearly all the overhead of having the conditional stuff in the function
  * bodies (+ the 1 and 2 way cases avoid saving any registers too).
+ *
+ * We want to eliminate unnecessary bus transactions, so this code uses
+ * a non-obvious technique.
+ *
+ * Loop over a cache way sized block of, one cache line at a time. For each
+ * line, use movca.a to cause the current cache line contents to be written
+ * back, but without reading anything from main memory. However this has the
+ * side effect that the cache is now caching that memory location. So follow
+ * this with a cache invalidate to mark the cache line invalid. And do all
+ * this with interrupts disabled, to avoid the cache line being accidently
+ * evicted while it is holding garbage.
+ *
+ * This also breaks in a number of circumstances:
+ * - if there are modifications to the region of memory just above
+ *   empty_zero_page (for example because a breakpoint has been placed
+ *   there), then these can be lost.
+ *
+ *   This is because the the memory address which the cache temporarily
+ *   caches in the above description is empty_zero_page. So the
+ *   movca.l hits the cache (it is assumed that it misses, or at least
+ *   isn't dirty), modifies the line and then invalidates it, losing the
+ *   required change.
+ *
+ * - If caches are disabled or configured in write-through mode, then
+ *   the movca.l writes garbage directly into memory.
  */
+static void __flush_dcache_segment_writethrough(unsigned long start,
+					        unsigned long extent_per_way)
+{
+	unsigned long addr;
+	int i;
+
+	addr = CACHE_OC_ADDRESS_ARRAY | (start & cpu_data->dcache.entry_mask);
+
+	while (extent_per_way) {
+		for (i = 0; i < cpu_data->dcache.ways; i++)
+			__raw_writel(0, addr + cpu_data->dcache.way_incr * i);
+
+		addr += cpu_data->dcache.linesz;
+		extent_per_way -= cpu_data->dcache.linesz;
+	}
+}
+
 static void __flush_dcache_segment_1way(unsigned long start,
 					unsigned long extent_per_way)
 {
@@ -655,24 +697,30 @@ extern void __weak sh4__flush_region_init(void);
  */
 void __init sh4_cache_init(void)
 {
+	unsigned int wt_enabled = !!(__raw_readl(CCR) & CCR_CACHE_WT);
+
 	printk("PVR=%08x CVR=%08x PRR=%08x\n",
 		ctrl_inl(CCN_PVR),
 		ctrl_inl(CCN_CVR),
 		ctrl_inl(CCN_PRR));
 
-	switch (boot_cpu_data.dcache.ways) {
-	case 1:
-		__flush_dcache_segment_fn = __flush_dcache_segment_1way;
-		break;
-	case 2:
-		__flush_dcache_segment_fn = __flush_dcache_segment_2way;
-		break;
-	case 4:
-		__flush_dcache_segment_fn = __flush_dcache_segment_4way;
-		break;
-	default:
-		panic("unknown number of cache ways\n");
-		break;
+	if (wt_enabled)
+		__flush_dcache_segment_fn = __flush_dcache_segment_writethrough;
+	else {
+		switch (boot_cpu_data.dcache.ways) {
+		case 1:
+			__flush_dcache_segment_fn = __flush_dcache_segment_1way;
+			break;
+		case 2:
+			__flush_dcache_segment_fn = __flush_dcache_segment_2way;
+			break;
+		case 4:
+			__flush_dcache_segment_fn = __flush_dcache_segment_4way;
+			break;
+		default:
+			panic("unknown number of cache ways\n");
+			break;
+		}
 	}
 
 	local_flush_icache_range	= sh4_flush_icache_range;
diff --git a/arch/sh/mm/ioremap_32.c b/arch/sh/mm/ioremap_32.c
index da2f4186f2c..c3250614e3a 100644
--- a/arch/sh/mm/ioremap_32.c
+++ b/arch/sh/mm/ioremap_32.c
@@ -57,14 +57,6 @@ void __iomem *__ioremap(unsigned long phys_addr, unsigned long size,
 	if (is_pci_memory_fixed_range(phys_addr, size))
 		return (void __iomem *)phys_addr;
 
-#if !defined(CONFIG_PMB_FIXED)
-	/*
-	 * Don't allow anybody to remap normal RAM that we're using..
-	 */
-	if (phys_addr < virt_to_phys(high_memory))
-		return NULL;
-#endif
-
 	/*
 	 * Mappings have to be page-aligned
 	 */
diff --git a/arch/sh/mm/tlb-sh4.c b/arch/sh/mm/tlb-sh4.c
index 7d3c63e707a..8cf550e2570 100644
--- a/arch/sh/mm/tlb-sh4.c
+++ b/arch/sh/mm/tlb-sh4.c
@@ -43,9 +43,12 @@ void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
 	 */
 	ctrl_outl(pte.pte_high, MMU_PTEA);
 #else
-	if (cpu_data->flags & CPU_HAS_PTEA)
-		/* TODO: make this look less hacky */
-		ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA);
+	if (cpu_data->flags & CPU_HAS_PTEA) {
+		/* The last 3 bits and the first one of pteval contains
+		 * the PTEA timing control and space attribute bits
+		 */
+		ctrl_outl(copy_ptea_attributes(pteval), MMU_PTEA);
+	}
 #endif
 
 	/* Set PTEL register */