[ARM] mm 9: add additional device memory types

Add cached device type for ioremap_cached().  Group all device memory
types together, and ensure that they all have a "MT_DEVICE" prefix.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-ixp2000/core.c

@@ -84,59 +84,59 @@ static struct map_desc ixp2000_io_desc[] __initdata = {
 		.virtual	= IXP2000_CAP_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_CAP_PHYS_BASE),
 		.length		= IXP2000_CAP_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_INTCTL_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_INTCTL_PHYS_BASE),
 		.length		= IXP2000_INTCTL_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_PCI_CREG_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_PCI_CREG_PHYS_BASE),
 		.length		= IXP2000_PCI_CREG_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_PCI_CSR_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_PCI_CSR_PHYS_BASE),
 		.length		= IXP2000_PCI_CSR_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_MSF_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_MSF_PHYS_BASE),
 		.length		= IXP2000_MSF_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_SCRATCH_RING_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_SCRATCH_RING_PHYS_BASE),
 		.length		= IXP2000_SCRATCH_RING_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_SRAM0_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_SRAM0_PHYS_BASE),
 		.length		= IXP2000_SRAM0_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_PCI_IO_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_PCI_IO_PHYS_BASE),
 		.length		= IXP2000_PCI_IO_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_PCI_CFG0_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_PCI_CFG0_PHYS_BASE),
 		.length		= IXP2000_PCI_CFG0_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= IXP2000_PCI_CFG1_VIRT_BASE,
 		.pfn		= __phys_to_pfn(IXP2000_PCI_CFG1_PHYS_BASE),
 		.length		= IXP2000_PCI_CFG1_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}
 };
 
 void __init ixp2000_map_io(void)
 {
 	/*
-	 * On IXP2400 CPUs we need to use MT_IXP2000_DEVICE so that
+	 * On IXP2400 CPUs we need to use MT_DEVICE_IXP2000 so that
 	 * XCB=101 (to avoid triggering erratum #66), and given that
 	 * this mode speeds up I/O accesses and we have write buffer
 	 * flushes in the right places anyway, it doesn't hurt to use

arch/arm/mach-ixp2000/enp2611.c

@@ -70,17 +70,17 @@ static struct map_desc enp2611_io_desc[] __initdata = {
 		.virtual	= ENP2611_CALEB_VIRT_BASE,
 		.pfn		= __phys_to_pfn(ENP2611_CALEB_PHYS_BASE),
 		.length		= ENP2611_CALEB_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= ENP2611_PM3386_0_VIRT_BASE,
 		.pfn		= __phys_to_pfn(ENP2611_PM3386_0_PHYS_BASE),
 		.length		= ENP2611_PM3386_0_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}, {
 		.virtual	= ENP2611_PM3386_1_VIRT_BASE,
 		.pfn		= __phys_to_pfn(ENP2611_PM3386_1_PHYS_BASE),
 		.length		= ENP2611_PM3386_1_SIZE,
-		.type		= MT_IXP2000_DEVICE,
+		.type		= MT_DEVICE_IXP2000,
 	}
 };
 

arch/arm/mm/mmu.c

@@ -176,13 +176,34 @@ void adjust_cr(unsigned long mask, unsigned long set)
 }
 #endif
 
+#define PROT_PTE_DEVICE		L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_WRITE
+#define PROT_SECT_DEVICE	PMD_TYPE_SECT|PMD_SECT_XN|PMD_SECT_AP_WRITE
+
 static struct mem_type mem_types[] = {
-	[MT_DEVICE] = {
-		.prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
-				L_PTE_WRITE,
+	[MT_DEVICE] = {		  /* Strongly ordered / ARMv6 shared device */
+		.prot_pte	= PROT_PTE_DEVICE,
+		.prot_l1	= PMD_TYPE_TABLE,
+		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_UNCACHED,
+		.domain		= DOMAIN_IO,
+	},
+	[MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */
+		.prot_pte	= PROT_PTE_DEVICE,
+		.prot_pte_ext	= PTE_EXT_TEX(2),
+		.prot_l1	= PMD_TYPE_TABLE,
+		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_TEX(2),
+		.domain		= DOMAIN_IO,
+	},
+	[MT_DEVICE_CACHED] = {	  /* ioremap_cached */
+		.prot_pte	= PROT_PTE_DEVICE | L_PTE_CACHEABLE | L_PTE_BUFFERABLE,
+		.prot_l1	= PMD_TYPE_TABLE,
+		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_WB,
+		.domain		= DOMAIN_IO,
+	},	
+	[MT_DEVICE_IXP2000] = {	  /* IXP2400 requires XCB=101 for on-chip I/O */
+		.prot_pte	= PROT_PTE_DEVICE,
 		.prot_l1	= PMD_TYPE_TABLE,
-		.prot_sect = PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_UNCACHED |
-				PMD_SECT_AP_WRITE,
+		.prot_sect	= PROT_SECT_DEVICE | PMD_SECT_BUFFERABLE |
+				  PMD_SECT_TEX(1),
 		.domain		= DOMAIN_IO,
 	},
 	[MT_CACHECLEAN] = {
@@ -213,21 +234,6 @@ static struct mem_type mem_types[] = {
 		.prot_sect = PMD_TYPE_SECT,
 		.domain    = DOMAIN_KERNEL,
 	},
-	[MT_IXP2000_DEVICE] = { /* IXP2400 requires XCB=101 for on-chip I/O */
-		.prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
-				L_PTE_WRITE,
-		.prot_l1   = PMD_TYPE_TABLE,
-		.prot_sect = PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_UNCACHED |
-				PMD_SECT_AP_WRITE | PMD_SECT_BUFFERABLE |
-				PMD_SECT_TEX(1),
-		.domain    = DOMAIN_IO,
-	},
-	[MT_NONSHARED_DEVICE] = {
-		.prot_l1   = PMD_TYPE_TABLE,
-		.prot_sect = PMD_TYPE_SECT | PMD_SECT_XN | PMD_SECT_NONSHARED_DEV |
-				PMD_SECT_AP_WRITE,
-		.domain    = DOMAIN_IO,
-	}
 };
 
 const struct mem_type *get_mem_type(unsigned int type)

include/asm-arm/mach/map.h

@@ -17,14 +17,18 @@ struct map_desc {
 };
 
 #define MT_DEVICE		0
-#define MT_CACHECLEAN		1
-#define MT_MINICLEAN		2
-#define MT_LOW_VECTORS		3
-#define MT_HIGH_VECTORS		4
-#define MT_MEMORY		5
-#define MT_ROM			6
-#define MT_IXP2000_DEVICE	7
-#define MT_NONSHARED_DEVICE	8
+#define MT_DEVICE_NONSHARED	1
+#define MT_DEVICE_CACHED	2
+#define MT_DEVICE_IXP2000	3
+#define MT_CACHECLEAN		4
+#define MT_MINICLEAN		5
+#define MT_LOW_VECTORS		6
+#define MT_HIGH_VECTORS		7
+#define MT_MEMORY		8
+#define MT_ROM			9
+
+#define MT_NONSHARED_DEVICE	MT_DEVICE_NONSHARED
+#define MT_IXP2000_DEVICE	MT_DEVICE_IXP2000
 
 #ifdef CONFIG_MMU
 extern void iotable_init(struct map_desc *, int);