Initial import

1 files changed, 81 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/sram.c b/arch/arm/mach-davinci/sram.c
new file mode 100644
index 000000000..8540dddf1
--- /dev/null
+++ b/arch/arm/mach-davinci/sram.c
@@ -0,0 +1,81 @@
+/*
+ * 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/init.h>
+#include <linux/io.h>
+#include <linux/genalloc.h>
+
+#include <mach/common.h>
+#include <mach/sram.h>
+
+static struct gen_pool *sram_pool;
+
+struct gen_pool *sram_get_gen_pool(void)
+{
+	return sram_pool;
+}
+
+void *sram_alloc(size_t len, dma_addr_t *dma)
+{
+	dma_addr_t dma_base = davinci_soc_info.sram_dma;
+
+	if (dma)
+		*dma = 0;
+	if (!sram_pool || (dma && !dma_base))
+		return NULL;
+
+	return gen_pool_dma_alloc(sram_pool, len, dma);
+
+}
+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)
+{
+	phys_addr_t phys = davinci_soc_info.sram_dma;
+	unsigned len = davinci_soc_info.sram_len;
+	int status = 0;
+	void __iomem *addr;
+
+	if (len) {
+		len = min_t(unsigned, len, SRAM_SIZE);
+		sram_pool = gen_pool_create(ilog2(SRAM_GRANULARITY), -1);
+		if (!sram_pool)
+			status = -ENOMEM;
+	}
+
+	if (sram_pool) {
+		addr = ioremap(phys, len);
+		if (!addr)
+			return -ENOMEM;
+		status = gen_pool_add_virt(sram_pool, (unsigned long) addr,
+					   phys, len, -1);
+		if (status < 0)
+			iounmap(addr);
+	}
+
+	WARN_ON(status < 0);
+	return status;
+}
+core_initcall(sram_init);
+