1 files changed, 74 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/sram.c b/arch/arm/mach-davinci/sram.c
new file mode 100644
index 000000000000..db54b2a66b4d
--- /dev/null
+++ b/arch/arm/mach-davinci/sram.c
@@ -0,0 +1,74 @@
+/*
+ * mach-davinci/sram.c - DaVinci simple SRAM allocator
+ *
+ * Copyright (C) 2009 David Brownell
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/genalloc.h>
+
+#include <mach/common.h>
+#include <mach/memory.h>
+#include <mach/sram.h>
+
+
+static struct gen_pool *sram_pool;
+
+void *sram_alloc(size_t len, dma_addr_t *dma)
+{
+        unsigned long vaddr;
+        dma_addr_t dma_base = davinci_soc_info.sram_dma;
+
+        if (dma)
+                *dma = 0;
+        if (!sram_pool || (dma && !dma_base))
+                return NULL;
+
+        vaddr = gen_pool_alloc(sram_pool, len);
+        if (!vaddr)
+                return NULL;
+
+        if (dma)
+                *dma = dma_base + (vaddr - SRAM_VIRT);
+        return (void *)vaddr;
+
+}
+EXPORT_SYMBOL(sram_alloc);
+
+void sram_free(void *addr, size_t len)
+{
+        gen_pool_free(sram_pool, (unsigned long) addr, len);
+}
+EXPORT_SYMBOL(sram_free);
+
+
+/*
+ * REVISIT This supports CPU and DMA access to/from SRAM, but it
+ * doesn't (yet?) support some other notable uses of SRAM:  as TCM
+ * for data and/or instructions; and holding code needed to enter
+ * and exit suspend states (while DRAM can't be used).
+ */
+static int __init sram_init(void)
+{
+        unsigned len = davinci_soc_info.sram_len;
+        int status = 0;
+
+        if (len) {
+                len = min(len, SRAM_SIZE);
+                sram_pool = gen_pool_create(ilog2(SRAM_GRANULARITY), -1);
+                if (!sram_pool)
+                        status = -ENOMEM;
+        }
+        if (sram_pool)
+                status = gen_pool_add(sram_pool, SRAM_VIRT, len, -1);
+        WARN_ON(status < 0);
+        return status;
+}
+core_initcall(sram_init);
+