TODO: - The ISP driver should start using the IOMMU directly without this wrapper.
Signed-off-by: Sakari Ailus <[email protected]> --- 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 <[email protected]> + * Sakari Ailus <[email protected]> + * + * 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 <[email protected]> + * Sakari Ailus <[email protected]> + * + * 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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
