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From 731527a7dc26533a878c7c5f36fc148fdcaa21b8 Mon Sep 17 00:00:00 2001
From: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Date: Tue, 10 Mar 2009 10:49:02 +0200
Subject: [PATCH] omap3isp: Add ISP MMU wrapper
TODO:
- The ISP driver should start using the IOMMU directly without this wrapper.
Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
---
drivers/media/video/isp/ispmmu.c | 141 ++++++++++++++++++++++++++++++++++++++
drivers/media/video/isp/ispmmu.h | 36 ++++++++++
2 files changed, 177 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/isp/ispmmu.c
create mode 100644 drivers/media/video/isp/ispmmu.h
diff --git a/drivers/media/video/isp/ispmmu.c b/drivers/media/video/isp/ispmmu.c
new file mode 100644
index 0000000..f872c71
--- /dev/null
+++ b/drivers/media/video/isp/ispmmu.c
@@ -0,0 +1,141 @@
+/*
+ * omap iommu wrapper for TI's OMAP3430 Camera ISP
+ *
+ * Copyright (C) 2008--2009 Nokia.
+ *
+ * Contributors:
+ * Hiroshi Doyu <hiroshi.doyu@nokia.com>
+ * Sakari Ailus <sakari.ailus@nokia.com>
+ *
+ * This package is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/module.h>
+
+#include "ispmmu.h"
+#include "isp.h"
+
+#include <mach/iommu.h>
+#include <mach/iovmm.h>
+
+#define IOMMU_FLAG (IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_8)
+
+static struct iommu *isp_iommu;
+
+dma_addr_t ispmmu_vmalloc(size_t bytes)
+{
+ return (dma_addr_t)iommu_vmalloc(isp_iommu, 0, bytes, IOMMU_FLAG);
+}
+
+void ispmmu_vfree(const dma_addr_t da)
+{
+ iommu_vfree(isp_iommu, (u32)da);
+}
+
+dma_addr_t ispmmu_kmap(u32 pa, int size)
+{
+ void *da;
+
+ da = (void *)iommu_kmap(isp_iommu, 0, pa, size, IOMMU_FLAG);
+ if (IS_ERR(da))
+ return PTR_ERR(da);
+
+ return (dma_addr_t)da;
+}
+
+void ispmmu_kunmap(dma_addr_t da)
+{
+ iommu_kunmap(isp_iommu, (u32)da);
+}
+
+dma_addr_t ispmmu_vmap(const struct scatterlist *sglist,
+ int sglen)
+{
+ int err;
+ void *da;
+ struct sg_table *sgt;
+ unsigned int i;
+ struct scatterlist *sg, *src = (struct scatterlist *)sglist;
+
+ /*
+ * convert isp sglist to iommu sgt
+ * FIXME: should be fixed in the upper layer?
+ */
+ sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
+ if (!sgt)
+ return -ENOMEM;
+ err = sg_alloc_table(sgt, sglen, GFP_KERNEL);
+ if (err)
+ goto err_sg_alloc;
+
+ for_each_sg(sgt->sgl, sg, sgt->nents, i)
+ sg_set_buf(sg, phys_to_virt(sg_dma_address(src + i)),
+ sg_dma_len(src + i));
+
+ da = (void *)iommu_vmap(isp_iommu, 0, sgt, IOMMU_FLAG);
+ if (IS_ERR(da))
+ goto err_vmap;
+
+ return (dma_addr_t)da;
+
+err_vmap:
+ sg_free_table(sgt);
+err_sg_alloc:
+ kfree(sgt);
+ return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(ispmmu_vmap);
+
+void ispmmu_vunmap(dma_addr_t da)
+{
+ struct sg_table *sgt;
+
+ sgt = iommu_vunmap(isp_iommu, (u32)da);
+ if (!sgt)
+ return;
+ sg_free_table(sgt);
+ kfree(sgt);
+}
+EXPORT_SYMBOL_GPL(ispmmu_vunmap);
+
+void ispmmu_save_context(void)
+{
+ if (isp_iommu)
+ iommu_save_ctx(isp_iommu);
+}
+
+void ispmmu_restore_context(void)
+{
+ if (isp_iommu)
+ iommu_restore_ctx(isp_iommu);
+}
+
+int __init ispmmu_init(void)
+{
+ int err = 0;
+
+ isp_get();
+ isp_iommu = iommu_get("isp");
+ if (IS_ERR(isp_iommu)) {
+ err = PTR_ERR(isp_iommu);
+ isp_iommu = NULL;
+ }
+ isp_put();
+
+ return err;
+}
+
+void ispmmu_cleanup(void)
+{
+ isp_get();
+ if (isp_iommu)
+ iommu_put(isp_iommu);
+ isp_put();
+ isp_iommu = NULL;
+}
diff --git a/drivers/media/video/isp/ispmmu.h b/drivers/media/video/isp/ispmmu.h
new file mode 100644
index 0000000..0bc5bcb
--- /dev/null
+++ b/drivers/media/video/isp/ispmmu.h
@@ -0,0 +1,36 @@
+/*
+ * omap iommu wrapper for TI's OMAP3430 Camera ISP
+ *
+ * Copyright (C) 2008--2009 Nokia.
+ *
+ * Contributors:
+ * Hiroshi Doyu <hiroshi.doyu@nokia.com>
+ * Sakari Ailus <sakari.ailus@nokia.com>
+ *
+ * This package is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef OMAP_ISP_MMU_H
+#define OMAP_ISP_MMU_H
+
+#include <linux/err.h>
+#include <linux/scatterlist.h>
+
+dma_addr_t ispmmu_vmalloc(size_t bytes);
+void ispmmu_vfree(const dma_addr_t da);
+dma_addr_t ispmmu_kmap(u32 pa, int size);
+void ispmmu_kunmap(dma_addr_t da);
+dma_addr_t ispmmu_vmap(const struct scatterlist *sglist, int sglen);
+void ispmmu_vunmap(dma_addr_t da);
+void ispmmu_save_context(void);
+void ispmmu_restore_context(void);
+int ispmmu_init(void);
+void ispmmu_cleanup(void);
+
+#endif /* OMAP_ISP_MMU_H */
--
1.5.6.5
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