Merge tag 'xtensa-20151108' of git://github.com/czankel/xtensa-linux

Pull xtensa updates from Chris Zankel:

 - fix remaining issues with noMMU cores
 - fix build for cores w/o cache or zero overhead loop options
 - fix boot of secondary cores in SMP configuration
 - add support for DMA to high memory pages
 - add dma_to_phys and phys_to_dma functions.

* tag 'xtensa-20151108' of git://github.com/czankel/xtensa-linux:
  xtensa: implement dma_to_phys and phys_to_dma
  xtensa: support DMA to high memory
  Revert "xtensa: cache inquiry and unaligned cache handling functions"
  xtensa: drop unused sections and remapped reset handlers
  xtensa: fix secondary core boot in SMP
  xtensa: add FORCE_MAX_ZONEORDER to Kconfig
  xtensa: nommu: provide defconfig for de212 on kc705
  xtensa: nommu: xtfpga: add kc705 DTS
  xtensa: add de212 core variant
  xtensa: nommu: select HAVE_FUTEX_CMPXCHG
  xtensa: nommu: fix default memory start address
  xtensa: nommu: provide correct KIO addresses
  xtensa: nommu: fix USER_RING definition
  xtensa: xtfpga: fix integer overflow in TASK_SIZE
  xtensa: fix build for configs without cache options
  xtensa: fixes for configs without loop option

8 files changed, 80 insertions, 123 deletions

diff --git a/arch/xtensa/include/asm/asmmacro.h b/arch/xtensa/include/asm/asmmacro.h
index 755320f..746dcc8 100644
--- a/arch/xtensa/include/asm/asmmacro.h
+++ b/arch/xtensa/include/asm/asmmacro.h
@@ -35,9 +35,10 @@
  * __loop  as
  *	   restart loop. 'as' register must not have been modified!
  *
- * __endla ar, at, incr
+ * __endla ar, as, incr
  *	   ar	start address (modified)
- *	   as	scratch register used by macro
+ *	   as	scratch register used by __loops/__loopi macros or
+ *		end address used by __loopt macro
  *	   inc	increment
  */
 
@@ -97,7 +98,7 @@
 	.endm
 
 /*
- * loop from ar to ax
+ * loop from ar to as
  */
 
 	.macro	__loopt	ar, as, at, incr_log2
diff --git a/arch/xtensa/include/asm/cacheasm.h b/arch/xtensa/include/asm/cacheasm.h
index 60e1877..e0f9e11 100644
--- a/arch/xtensa/include/asm/cacheasm.h
+++ b/arch/xtensa/include/asm/cacheasm.h
@@ -73,7 +73,9 @@
 
 	.macro	___unlock_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at diu XCHAL_DCACHE_SIZE XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
@@ -90,30 +92,38 @@
 
 	.macro	___flush_invalidate_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at diwbi XCHAL_DCACHE_SIZE XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___flush_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at diwb XCHAL_DCACHE_SIZE XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_dcache_all ar at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_all \ar \at dii __stringify(DCACHE_WAY_SIZE) \
 			 XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_icache_all ar at
 
+#if XCHAL_ICACHE_SIZE
 	__loop_cache_all \ar \at iii __stringify(ICACHE_WAY_SIZE) \
 			 XCHAL_ICACHE_LINEWIDTH
+#endif
 
 	.endm
 
@@ -121,28 +131,36 @@
 
 	.macro	___flush_invalidate_dcache_range ar as at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_range \ar \as \at dhwbi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___flush_dcache_range ar as at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_range \ar \as \at dhwb XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_dcache_range ar as at
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_range \ar \as \at dhi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_icache_range ar as at
 
+#if XCHAL_ICACHE_SIZE
 	__loop_cache_range \ar \as \at ihi XCHAL_ICACHE_LINEWIDTH
+#endif
 
 	.endm
 
@@ -150,27 +168,35 @@
 
 	.macro	___flush_invalidate_dcache_page ar as
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_page \ar \as dhwbi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro ___flush_dcache_page ar as
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_page \ar \as dhwb XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_dcache_page ar as
 
+#if XCHAL_DCACHE_SIZE
 	__loop_cache_page \ar \as dhi XCHAL_DCACHE_LINEWIDTH
+#endif
 
 	.endm
 
 
 	.macro	___invalidate_icache_page ar as
 
+#if XCHAL_ICACHE_SIZE
 	__loop_cache_page \ar \as ihi XCHAL_ICACHE_LINEWIDTH
+#endif
 
 	.endm
diff --git a/arch/xtensa/include/asm/cacheflush.h b/arch/xtensa/include/asm/cacheflush.h
index 5f67ace..397d6a1 100644
--- a/arch/xtensa/include/asm/cacheflush.h
+++ b/arch/xtensa/include/asm/cacheflush.h
@@ -55,9 +55,14 @@ extern void __flush_dcache_range(unsigned long, unsigned long);
 extern void __flush_invalidate_dcache_page(unsigned long);
 extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
 #else
-# define __flush_dcache_range(p,s)		do { } while(0)
-# define __flush_dcache_page(p)			do { } while(0)
-# define __flush_invalidate_dcache_page(p) 	__invalidate_dcache_page(p)
+static inline void __flush_dcache_page(unsigned long va)
+{
+}
+static inline void __flush_dcache_range(unsigned long va, unsigned long sz)
+{
+}
+# define __flush_invalidate_dcache_all()	__invalidate_dcache_all()
+# define __flush_invalidate_dcache_page(p)	__invalidate_dcache_page(p)
 # define __flush_invalidate_dcache_range(p,s)	__invalidate_dcache_range(p,s)
 #endif
 
@@ -174,99 +179,4 @@ extern void copy_from_user_page(struct vm_area_struct*, struct page*,
 
 #endif
 
-#define XTENSA_CACHEBLK_LOG2	29
-#define XTENSA_CACHEBLK_SIZE	(1 << XTENSA_CACHEBLK_LOG2)
-#define XTENSA_CACHEBLK_MASK	(7 << XTENSA_CACHEBLK_LOG2)
-
-#if XCHAL_HAVE_CACHEATTR
-static inline u32 xtensa_get_cacheattr(void)
-{
-	u32 r;
-	asm volatile("	rsr %0, cacheattr" : "=a"(r));
-	return r;
-}
-
-static inline u32 xtensa_get_dtlb1(u32 addr)
-{
-	u32 r = addr & XTENSA_CACHEBLK_MASK;
-	return r | ((xtensa_get_cacheattr() >> (r >> (XTENSA_CACHEBLK_LOG2-2)))
-			& 0xF);
-}
-#else
-static inline u32 xtensa_get_dtlb1(u32 addr)
-{
-	u32 r;
-	asm volatile("	rdtlb1 %0, %1" : "=a"(r) : "a"(addr));
-	asm volatile("	dsync");
-	return r;
-}
-
-static inline u32 xtensa_get_cacheattr(void)
-{
-	u32 r = 0;
-	u32 a = 0;
-	do {
-		a -= XTENSA_CACHEBLK_SIZE;
-		r = (r << 4) | (xtensa_get_dtlb1(a) & 0xF);
-	} while (a);
-	return r;
-}
-#endif
-
-static inline int xtensa_need_flush_dma_source(u32 addr)
-{
-	return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) >= 4;
-}
-
-static inline int xtensa_need_invalidate_dma_destination(u32 addr)
-{
-	return (xtensa_get_dtlb1(addr) & ((1 << XCHAL_CA_BITS) - 1)) != 2;
-}
-
-static inline void flush_dcache_unaligned(u32 addr, u32 size)
-{
-	u32 cnt;
-	if (size) {
-		cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr)
-			+ XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE;
-		while (cnt--) {
-			asm volatile("	dhwb %0, 0" : : "a"(addr));
-			addr += XCHAL_DCACHE_LINESIZE;
-		}
-		asm volatile("	dsync");
-	}
-}
-
-static inline void invalidate_dcache_unaligned(u32 addr, u32 size)
-{
-	int cnt;
-	if (size) {
-		asm volatile("	dhwbi %0, 0 ;" : : "a"(addr));
-		cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr)
-			- XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE;
-		while (cnt-- > 0) {
-			asm volatile("	dhi %0, %1" : : "a"(addr),
-						"n"(XCHAL_DCACHE_LINESIZE));
-			addr += XCHAL_DCACHE_LINESIZE;
-		}
-		asm volatile("	dhwbi %0, %1" : : "a"(addr),
-						"n"(XCHAL_DCACHE_LINESIZE));
-		asm volatile("	dsync");
-	}
-}
-
-static inline void flush_invalidate_dcache_unaligned(u32 addr, u32 size)
-{
-	u32 cnt;
-	if (size) {
-		cnt = (size + ((XCHAL_DCACHE_LINESIZE - 1) & addr)
-			+ XCHAL_DCACHE_LINESIZE - 1) / XCHAL_DCACHE_LINESIZE;
-		while (cnt--) {
-			asm volatile("	dhwbi %0, 0" : : "a"(addr));
-			addr += XCHAL_DCACHE_LINESIZE;
-		}
-		asm volatile("	dsync");
-	}
-}
-
 #endif /* _XTENSA_CACHEFLUSH_H */
diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h
index 4427f38..66c9ba2 100644
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h
@@ -35,4 +35,14 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 		    enum dma_data_direction direction);
 
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	return (dma_addr_t)paddr;
+}
+
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+{
+	return (phys_addr_t)daddr;
+}
+
 #endif	/* _XTENSA_DMA_MAPPING_H */
diff --git a/arch/xtensa/include/asm/initialize_mmu.h b/arch/xtensa/include/asm/initialize_mmu.h
index e256f22..7a1e075 100644
--- a/arch/xtensa/include/asm/initialize_mmu.h
+++ b/arch/xtensa/include/asm/initialize_mmu.h
@@ -161,7 +161,8 @@
 #endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU &&
 	  XCHAL_HAVE_SPANNING_WAY */
 
-#if !defined(CONFIG_MMU) && XCHAL_HAVE_TLBS
+#if !defined(CONFIG_MMU) && XCHAL_HAVE_TLBS && \
+		(XCHAL_DCACHE_SIZE || XCHAL_ICACHE_SIZE)
 	/* Enable data and instruction cache in the DEFAULT_MEMORY region
 	 * if the processor has DTLB and ITLB.
 	 */
@@ -175,14 +176,18 @@
 1:
 	sub	a9, a9, a8
 2:
+#if XCHAL_DCACHE_SIZE
 	rdtlb1	a3, a5
-	ritlb1	a4, a5
 	and	a3, a3, a6
-	and	a4, a4, a6
 	or	a3, a3, a7
-	or	a4, a4, a7
 	wdtlb	a3, a5
+#endif
+#if XCHAL_ICACHE_SIZE
+	ritlb1	a4, a5
+	and	a4, a4, a6
+	or	a4, a4, a7
 	witlb	a4, a5
+#endif
 	add	a5, a5, a8
 	bltu	a8, a9, 1b
 
diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h
index 867840f..74fed0b 100644
--- a/arch/xtensa/include/asm/io.h
+++ b/arch/xtensa/include/asm/io.h
@@ -25,15 +25,6 @@
 
 #ifdef CONFIG_MMU
 
-#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && defined(CONFIG_OF)
-extern unsigned long xtensa_kio_paddr;
-
-static inline unsigned long xtensa_get_kio_paddr(void)
-{
-	return xtensa_kio_paddr;
-}
-#endif
-
 /*
  * Return the virtual address for the specified bus memory.
  * Note that we currently don't support any address outside the KIO segment.
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index a5e929a..fb02fdc 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -18,7 +18,11 @@
  * We only use two ring levels, user and kernel space.
  */
 
+#ifdef CONFIG_MMU
 #define USER_RING		1	/* user ring level */
+#else
+#define USER_RING		0
+#endif
 #define KERNEL_RING		0	/* kernel ring level */
 
 /*
diff --git a/arch/xtensa/include/asm/vectors.h b/arch/xtensa/include/asm/vectors.h
index a46c53f..288c776 100644
--- a/arch/xtensa/include/asm/vectors.h
+++ b/arch/xtensa/include/asm/vectors.h
@@ -21,13 +21,26 @@
 #include <variant/core.h>
 #include <platform/hardware.h>
 
+#if XCHAL_HAVE_PTP_MMU
 #define XCHAL_KIO_CACHED_VADDR		0xe0000000
 #define XCHAL_KIO_BYPASS_VADDR		0xf0000000
 #define XCHAL_KIO_DEFAULT_PADDR		0xf0000000
+#else
+#define XCHAL_KIO_BYPASS_VADDR		XCHAL_KIO_PADDR
+#define XCHAL_KIO_DEFAULT_PADDR		0x90000000
+#endif
 #define XCHAL_KIO_SIZE			0x10000000
 
-#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && defined(CONFIG_OF)
+#if (!XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY) && defined(CONFIG_OF)
 #define XCHAL_KIO_PADDR			xtensa_get_kio_paddr()
+#ifndef __ASSEMBLY__
+extern unsigned long xtensa_kio_paddr;
+
+static inline unsigned long xtensa_get_kio_paddr(void)
+{
+	return xtensa_kio_paddr;
+}
+#endif
 #else
 #define XCHAL_KIO_PADDR			XCHAL_KIO_DEFAULT_PADDR
 #endif
@@ -48,6 +61,9 @@
   #define LOAD_MEMORY_ADDRESS		0xD0003000
 #endif
 
+#define RESET_VECTOR1_VADDR		(VIRTUAL_MEMORY_ADDRESS + \
+					 XCHAL_RESET_VECTOR1_PADDR)
+
 #else /* !defined(CONFIG_MMU) */
   /* MMU Not being used - Virtual == Physical */
 
@@ -60,6 +76,8 @@
   /* Loaded just above possibly live vectors */
   #define LOAD_MEMORY_ADDRESS		(PLATFORM_DEFAULT_MEM_START + 0x3000)
 
+#define RESET_VECTOR1_VADDR		(XCHAL_RESET_VECTOR1_VADDR)
+
 #endif /* CONFIG_MMU */
 
 #define XC_VADDR(offset)		(VIRTUAL_MEMORY_ADDRESS  + offset)
@@ -67,14 +85,6 @@
 /* Used to set VECBASE register */
 #define VECBASE_RESET_VADDR		VIRTUAL_MEMORY_ADDRESS
 
-#define RESET_VECTOR_VECOFS		(XCHAL_RESET_VECTOR_VADDR - \
-						VECBASE_RESET_VADDR)
-#define RESET_VECTOR_VADDR		XC_VADDR(RESET_VECTOR_VECOFS)
-
-#define RESET_VECTOR1_VECOFS		(XCHAL_RESET_VECTOR1_VADDR - \
-						VECBASE_RESET_VADDR)
-#define RESET_VECTOR1_VADDR		XC_VADDR(RESET_VECTOR1_VECOFS)
-
 #if defined(XCHAL_HAVE_VECBASE) && XCHAL_HAVE_VECBASE
 
 #define USER_VECTOR_VADDR		XC_VADDR(XCHAL_USER_VECOFS)