4 files changed, 77 insertions, 0 deletions

diff --git a/arch/sh/include/asm/sram.h b/arch/sh/include/asm/sram.h
new file mode 100644
index 000000000000..a2808ce4c0aa
--- /dev/null
+++ b/arch/sh/include/asm/sram.h
@@ -0,0 +1,38 @@
+#ifndef __ASM_SRAM_H
+#define __ASM_SRAM_H
+
+#ifdef CONFIG_HAVE_SRAM_POOL
+
+#include <linux/spinlock.h>
+#include <linux/genalloc.h>
+
+/* arch/sh/mm/sram.c */
+extern struct gen_pool *sram_pool;
+
+static inline unsigned long sram_alloc(size_t len)
+{
+        if (!sram_pool)
+                return 0UL;
+
+        return gen_pool_alloc(sram_pool, len);
+}
+
+static inline void sram_free(unsigned long addr, size_t len)
+{
+        return gen_pool_free(sram_pool, addr, len);
+}
+
+#else
+
+static inline unsigned long sram_alloc(size_t len)
+{
+        return 0;
+}
+
+static inline void sram_free(unsigned long addr, size_t len)
+{
+}
+
+#endif /* CONFIG_HAVE_SRAM_POOL */
+
+#endif /* __ASM_SRAM_H */
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 1445ca6257df..09370392aff1 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -168,6 +168,10 @@ config IOREMAP_FIXED
 config UNCACHED_MAPPING
         bool
 
+config HAVE_SRAM_POOL
+        bool
+        select GENERIC_ALLOCATOR
+
 choice
         prompt "Kernel page size"
         default PAGE_SIZE_4KB
diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile
index 939663c55911..ab89ea4f9414 100644
--- a/arch/sh/mm/Makefile
+++ b/arch/sh/mm/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_PMB)		+= pmb.o
 obj-$(CONFIG_NUMA)              += numa.o
 obj-$(CONFIG_IOREMAP_FIXED)     += ioremap_fixed.o
 obj-$(CONFIG_UNCACHED_MAPPING)  += uncached.o
+obj-$(CONFIG_HAVE_SRAM_POOL)    += sram.o
 
 # Special flags for fault_64.o.  This puts restrictions on the number of
 # caller-save registers that the compiler can target when building this file.
diff --git a/arch/sh/mm/sram.c b/arch/sh/mm/sram.c
new file mode 100644
index 000000000000..bc156ec4545e
--- /dev/null
+++ b/arch/sh/mm/sram.c
@@ -0,0 +1,34 @@
+/*
+ * SRAM pool for tiny memories not otherwise managed.
+ *
+ * Copyright (C) 2010  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/sram.h>
+
+/*
+ * This provides a standard SRAM pool for tiny memories that can be
+ * added either by the CPU or the platform code. Typical SRAM sizes
+ * to be inserted in to the pool will generally be less than the page
+ * size, with anything more reasonably sized handled as a NUMA memory
+ * node.
+ */
+struct gen_pool *sram_pool;
+
+static int __init sram_pool_init(void)
+{
+        /*
+         * This is a global pool, we don't care about node locality.
+         */
+        sram_pool = gen_pool_create(1, -1);
+        if (unlikely(!sram_pool))
+                return -ENOMEM;
+
+        return 0;
+}
+core_initcall(sram_pool_init);