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-rw-r--r--arch/arm/mach-imx/iram_alloc.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/iram_alloc.c b/arch/arm/mach-imx/iram_alloc.c
new file mode 100644
index 00000000000..e05cf407db6
--- /dev/null
+++ b/arch/arm/mach-imx/iram_alloc.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/genalloc.h>
+#include "linux/platform_data/imx-iram.h"
+
+static unsigned long iram_phys_base;
+static void __iomem *iram_virt_base;
+static struct gen_pool *iram_pool;
+
+static inline void __iomem *iram_phys_to_virt(unsigned long p)
+{
+ return iram_virt_base + (p - iram_phys_base);
+}
+
+void __iomem *iram_alloc(unsigned int size, unsigned long *dma_addr)
+{
+ if (!iram_pool)
+ return NULL;
+
+ *dma_addr = gen_pool_alloc(iram_pool, size);
+ pr_debug("iram alloc - %dB@0x%lX\n", size, *dma_addr);
+ if (!*dma_addr)
+ return NULL;
+ return iram_phys_to_virt(*dma_addr);
+}
+EXPORT_SYMBOL(iram_alloc);
+
+void iram_free(unsigned long addr, unsigned int size)
+{
+ if (!iram_pool)
+ return;
+
+ gen_pool_free(iram_pool, addr, size);
+}
+EXPORT_SYMBOL(iram_free);
+
+int __init iram_init(unsigned long base, unsigned long size)
+{
+ iram_phys_base = base;
+
+ iram_pool = gen_pool_create(PAGE_SHIFT, -1);
+ if (!iram_pool)
+ return -ENOMEM;
+
+ gen_pool_add(iram_pool, base, size, -1);
+ iram_virt_base = ioremap(iram_phys_base, size);
+ if (!iram_virt_base)
+ return -EIO;
+
+ pr_debug("i.MX IRAM pool: %ld KB@0x%p\n", size / 1024, iram_virt_base);
+ return 0;
+}