[U-Boot] [PATCH 4/9] ARM: Implement non-cached memory support

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

Implement an API that can be used by drivers to allocate memory from a
poll that is mapped uncached. This is useful if drivers would otherwise
need to do extensive cache maintenance (or explicitly maintaining the
cache isn't safe).

The API is protected using the new CONFIG_SYS_NONCACHED_MEMORY setting.
Boards can set this to the size to be used for the non-cached area. The
area will typically be right below the malloc() area, but architectures
should take care of aligning the beginning and end of the area to honor
any mapping restrictions. Architectures must also ensure that mappings
established for this area do not overlap with the malloc() area (which
should remain cached for improved performance).

While the API is currently only implemented for ARM v7, it should be
generic enough to allow other architectures to implement it as well.

Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 README                        | 16 ++++++++++++++++
 arch/arm/include/asm/system.h |  5 +++++
 arch/arm/lib/cache.c          | 41 +++++++++++++++++++++++++++++++++++++++++
 common/board_r.c              | 11 +++++++++++
 4 files changed, 73 insertions(+)

diff --git a/README b/README
index 1d713596ec6f..807b2d0ef0f9 100644
--- a/README
+++ b/README
@@ -3759,6 +3759,22 @@ Configuration Settings:
 		Pre-relocation malloc() is only supported on ARM at present
 		but is fairly easy to enable for other archs.
 
+- CONFIG_SYS_NONCACHED_MEMORY:
+		Size of non-cached memory area. This area of memory will be
+		typically located right below the malloc() area and mapped
+		uncached in the MMU. This is useful for drivers that would
+		otherwise require a lot of explicit cache maintenance. For
+		some drivers it's also impossible to properly maintain the
+		cache. For example if the regions that need to be flushed
+		are not a multiple of the cache-line size, then a flush of
+		one region may result in overwriting data that hardware has
+		written to another region in the same cache-line. This can
+		happen for example in network drivers where descriptors for
+		buffers are typically smaller than the CPU cache-line (e.g.
+		16 bytes vs. 32 or 64 bytes).
+
+		Non-cached memory is only supported on 32-bit ARM at present.
+
 - CONFIG_SYS_BOOTM_LEN:
 		Normally compressed uImages are limited to an
 		uncompressed size of 8 MBytes. If this is not enough,
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 4b771c261a8b..74ba6912bb81 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -211,6 +211,11 @@ void mmu_set_region_dcache_behaviour(unsigned long start, unsigned long size,
  */
 void mmu_page_table_flush(unsigned long start, unsigned long stop);
 
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+void noncached_init(void);
+unsigned long noncached_alloc(size_t size, size_t align);
+#endif /* CONFIG_SYS_NONCACHED_MEMORY */
+
 #endif /* __ASSEMBLY__ */
 
 #define arch_align_stack(x) (x)
diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c
index 4e597a4c1d16..cd0b5ef1c3f4 100644
--- a/arch/arm/lib/cache.c
+++ b/arch/arm/lib/cache.c
@@ -8,6 +8,7 @@
 /* for now: just dummy functions to satisfy the linker */
 
 #include <common.h>
+#include <malloc.h>
 
 __weak void flush_cache(unsigned long start, unsigned long size)
 {
@@ -49,3 +50,43 @@ __weak void enable_caches(void)
 {
 	puts("WARNING: Caches not enabled\n");
 }
+
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+/*
+ * Reserve one MMU section worth of address space below the malloc() area that
+ * will be mapped uncached.
+ */
+static unsigned long noncached_start;
+static unsigned long noncached_end;
+static unsigned long noncached_next;
+
+void noncached_init(void)
+{
+	unsigned long start, end, size;
+
+	end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE;
+	size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE);
+	start = end - size;
+
+	debug("mapping memory %#lx-%#lx non-cached\n", start, end);
+
+	noncached_start = start;
+	noncached_end = end;
+	noncached_next = start;
+
+	mmu_set_region_dcache_behaviour(noncached_start, size, DCACHE_OFF);
+}
+
+unsigned long noncached_alloc(size_t size, size_t align)
+{
+	unsigned long next = ALIGN(noncached_next, align);
+
+	if (next >= noncached_end || (next + size) >= noncached_end)
+		return 0;
+
+	debug("allocated %zu bytes of uncached memory @%#lx\n", size, next);
+	noncached_next = next + size;
+
+	return next;
+}
+#endif /* CONFIG_SYS_NONCACHED_MEMORY */
diff --git a/common/board_r.c b/common/board_r.c
index ba9a68dc6691..6b8e62bf032b 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -270,6 +270,14 @@ static int initr_malloc(void)
 	return 0;
 }
 
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+static int initr_noncached(void)
+{
+	noncached_init();
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_DM
 static int initr_dm(void)
 {
@@ -765,6 +773,9 @@ init_fnc_t init_sequence_r[] = {
 #endif
 	initr_barrier,
 	initr_malloc,
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+	initr_noncached,
+#endif
 	bootstage_relocate,
 #ifdef CONFIG_DM
 	initr_dm,
-- 
2.0.4