6 files changed, 528 insertions, 0 deletions

diff --git a/arch/arc/include/asm/dma-mapping.h b/arch/arc/include/asm/dma-mapping.h
new file mode 100644
index 000000000000..7fd150e97eb2
--- /dev/null
+++ b/arch/arc/include/asm/dma-mapping.h
@@ -0,0 +1,205 @@
+/*
+ * DMA Mapping glue for ARC
+ *
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program 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.
+ */
+
+#ifndef ASM_ARC_DMA_MAPPING_H
+#define ASM_ARC_DMA_MAPPING_H
+
+#include <asm-generic/dma-coherent.h>
+#include <asm/cacheflush.h>
+#include <plat/dma_addr.h>
+
+void *dma_alloc_noncoherent(struct device *dev, size_t size,
+                            dma_addr_t *dma_handle, gfp_t gfp);
+
+void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
+                          dma_addr_t dma_handle);
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+                         dma_addr_t *dma_handle, gfp_t gfp);
+
+void dma_free_coherent(struct device *dev, size_t size, void *kvaddr,
+                       dma_addr_t dma_handle);
+
+/* drivers/base/dma-mapping.c */
+extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
+                           void *cpu_addr, dma_addr_t dma_addr, size_t size);
+extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
+                                  void *cpu_addr, dma_addr_t dma_addr,
+                                  size_t size);
+
+#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
+#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
+
+/*
+ * streaming DMA Mapping API...
+ * CPU accesses page via normal paddr, thus needs to explicitly made
+ * consistent before each use
+ */
+
+static inline void __inline_dma_cache_sync(unsigned long paddr, size_t size,
+                                           enum dma_data_direction dir)
+{
+        switch (dir) {
+        case DMA_FROM_DEVICE:
+                dma_cache_inv(paddr, size);
+                break;
+        case DMA_TO_DEVICE:
+                dma_cache_wback(paddr, size);
+                break;
+        case DMA_BIDIRECTIONAL:
+                dma_cache_wback_inv(paddr, size);
+                break;
+        default:
+                pr_err("Invalid DMA dir [%d] for OP @ %lx\n", dir, paddr);
+        }
+}
+
+void __arc_dma_cache_sync(unsigned long paddr, size_t size,
+                          enum dma_data_direction dir);
+
+#define _dma_cache_sync(addr, sz, dir)                  \
+do {                                                    \
+        if (__builtin_constant_p(dir))                  \
+                __inline_dma_cache_sync(addr, sz, dir); \
+        else                                            \
+                __arc_dma_cache_sync(addr, sz, dir);    \
+}                                                       \
+while (0);
+
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *cpu_addr, size_t size,
+               enum dma_data_direction dir)
+{
+        _dma_cache_sync((unsigned long)cpu_addr, size, dir);
+        return plat_kernel_addr_to_dma(dev, cpu_addr);
+}
+
+static inline void
+dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
+                 size_t size, enum dma_data_direction dir)
+{
+}
+
+static inline dma_addr_t
+dma_map_page(struct device *dev, struct page *page,
+             unsigned long offset, size_t size,
+             enum dma_data_direction dir)
+{
+        unsigned long paddr = page_to_phys(page) + offset;
+        return dma_map_single(dev, (void *)paddr, size, dir);
+}
+
+static inline void
+dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
+               size_t size, enum dma_data_direction dir)
+{
+}
+
+static inline int
+dma_map_sg(struct device *dev, struct scatterlist *sg,
+           int nents, enum dma_data_direction dir)
+{
+        struct scatterlist *s;
+        int i;
+
+        for_each_sg(sg, s, nents, i)
+                sg->dma_address = dma_map_page(dev, sg_page(s), s->offset,
+                                               s->length, dir);
+
+        return nents;
+}
+
+static inline void
+dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+             int nents, enum dma_data_direction dir)
+{
+        struct scatterlist *s;
+        int i;
+
+        for_each_sg(sg, s, nents, i)
+                dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
+}
+
+static inline void
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+                        size_t size, enum dma_data_direction dir)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
+                        DMA_FROM_DEVICE);
+}
+
+static inline void
+dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+                           size_t size, enum dma_data_direction dir)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
+                        DMA_TO_DEVICE);
+}
+
+static inline void
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+                              unsigned long offset, size_t size,
+                              enum dma_data_direction direction)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
+                        size, DMA_FROM_DEVICE);
+}
+
+static inline void
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
+                                 unsigned long offset, size_t size,
+                                 enum dma_data_direction direction)
+{
+        _dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
+                        size, DMA_TO_DEVICE);
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
+                    enum dma_data_direction dir)
+{
+        int i;
+
+        for (i = 0; i < nelems; i++, sg++)
+                _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
+}
+
+static inline void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
+                       enum dma_data_direction dir)
+{
+        int i;
+
+        for (i = 0; i < nelems; i++, sg++)
+                _dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
+}
+
+static inline int dma_supported(struct device *dev, u64 dma_mask)
+{
+        /* Support 32 bit DMA mask exclusively */
+        return dma_mask == DMA_BIT_MASK(32);
+}
+
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+        return 0;
+}
+
+static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+        if (!dev->dma_mask || !dma_supported(dev, dma_mask))
+                return -EIO;
+
+        *dev->dma_mask = dma_mask;
+
+        return 0;
+}
+
+#endif
diff --git a/arch/arc/include/asm/dma.h b/arch/arc/include/asm/dma.h
new file mode 100644
index 000000000000..ca7c45181de9
--- /dev/null
+++ b/arch/arc/include/asm/dma.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program 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.
+ */
+
+#ifndef ASM_ARC_DMA_H
+#define ASM_ARC_DMA_H
+
+#define MAX_DMA_ADDRESS 0xC0000000
+
+#endif
diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h
new file mode 100644
index 000000000000..d20051bbbf02
--- /dev/null
+++ b/arch/arc/include/asm/io.h
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program 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.
+ */
+
+#ifndef _ASM_ARC_IO_H
+#define _ASM_ARC_IO_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+#include <asm/page.h>
+
+#define PCI_IOBASE ((void __iomem *)0)
+
+extern void __iomem *ioremap(unsigned long physaddr, unsigned long size);
+extern void iounmap(const void __iomem *addr);
+
+#define ioremap_nocache(phy, sz)        ioremap(phy, sz)
+#define ioremap_wc(phy, sz)             ioremap(phy, sz)
+
+/* Change struct page to physical address */
+#define page_to_phys(page)              (page_to_pfn(page) << PAGE_SHIFT)
+
+#define __raw_readb __raw_readb
+static inline u8 __raw_readb(const volatile void __iomem *addr)
+{
+        u8 b;
+
+        __asm__ __volatile__(
+        "       ldb%U1 %0, %1   \n"
+        : "=r" (b)
+        : "m" (*(volatile u8 __force *)addr)
+        : "memory");
+
+        return b;
+}
+
+#define __raw_readw __raw_readw
+static inline u16 __raw_readw(const volatile void __iomem *addr)
+{
+        u16 s;
+
+        __asm__ __volatile__(
+        "       ldw%U1 %0, %1   \n"
+        : "=r" (s)
+        : "m" (*(volatile u16 __force *)addr)
+        : "memory");
+
+        return s;
+}
+
+#define __raw_readl __raw_readl
+static inline u32 __raw_readl(const volatile void __iomem *addr)
+{
+        u32 w;
+
+        __asm__ __volatile__(
+        "       ld%U1 %0, %1    \n"
+        : "=r" (w)
+        : "m" (*(volatile u32 __force *)addr)
+        : "memory");
+
+        return w;
+}
+
+#define __raw_writeb __raw_writeb
+static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
+{
+        __asm__ __volatile__(
+        "       stb%U1 %0, %1   \n"
+        :
+        : "r" (b), "m" (*(volatile u8 __force *)addr)
+        : "memory");
+}
+
+#define __raw_writew __raw_writew
+static inline void __raw_writew(u16 s, volatile void __iomem *addr)
+{
+        __asm__ __volatile__(
+        "       stw%U1 %0, %1   \n"
+        :
+        : "r" (s), "m" (*(volatile u16 __force *)addr)
+        : "memory");
+
+}
+
+#define __raw_writel __raw_writel
+static inline void __raw_writel(u32 w, volatile void __iomem *addr)
+{
+        __asm__ __volatile__(
+        "       st%U1 %0, %1    \n"
+        :
+        : "r" (w), "m" (*(volatile u32 __force *)addr)
+        : "memory");
+
+}
+
+#include <asm-generic/io.h>
+
+#endif /* _ASM_ARC_IO_H */
diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
new file mode 100644
index 000000000000..12cc6485b218
--- /dev/null
+++ b/arch/arc/mm/dma.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program 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.
+ */
+
+/*
+ * DMA Coherent API Notes
+ *
+ * I/O is inherently non-coherent on ARC. So a coherent DMA buffer is
+ * implemented by accessintg it using a kernel virtual address, with
+ * Cache bit off in the TLB entry.
+ *
+ * The default DMA address == Phy address which is 0x8000_0000 based.
+ * A platform/device can make it zero based, by over-riding
+ * plat_{dma,kernel}_addr_to_{kernel,dma}
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/dma-debug.h>
+#include <linux/export.h>
+#include <asm/cacheflush.h>
+
+/*
+ * Helpers for Coherent DMA API.
+ */
+void *dma_alloc_noncoherent(struct device *dev, size_t size,
+                            dma_addr_t *dma_handle, gfp_t gfp)
+{
+        void *paddr;
+
+        /* This is linear addr (0x8000_0000 based) */
+        paddr = alloc_pages_exact(size, gfp);
+        if (!paddr)
+                return NULL;
+
+        /* This is bus address, platform dependent */
+        *dma_handle = plat_kernel_addr_to_dma(dev, paddr);
+
+        return paddr;
+}
+EXPORT_SYMBOL(dma_alloc_noncoherent);
+
+void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
+                          dma_addr_t dma_handle)
+{
+        free_pages_exact((void *)plat_dma_addr_to_kernel(dev, dma_handle),
+                         size);
+}
+EXPORT_SYMBOL(dma_free_noncoherent);
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+                         dma_addr_t *dma_handle, gfp_t gfp)
+{
+        void *paddr, *kvaddr;
+
+        /* This is linear addr (0x8000_0000 based) */
+        paddr = alloc_pages_exact(size, gfp);
+        if (!paddr)
+                return NULL;
+
+        /* This is kernel Virtual address (0x7000_0000 based) */
+        kvaddr = ioremap_nocache((unsigned long)paddr, size);
+        if (kvaddr != NULL)
+                memset(kvaddr, 0, size);
+
+        /* This is bus address, platform dependent */
+        *dma_handle = plat_kernel_addr_to_dma(dev, paddr);
+
+        return kvaddr;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *dev, size_t size, void *kvaddr,
+                       dma_addr_t dma_handle)
+{
+        iounmap((void __force __iomem *)kvaddr);
+
+        free_pages_exact((void *)plat_dma_addr_to_kernel(dev, dma_handle),
+                         size);
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+/*
+ * Helper for streaming DMA...
+ */
+void __arc_dma_cache_sync(unsigned long paddr, size_t size,
+                          enum dma_data_direction dir)
+{
+        __inline_dma_cache_sync(paddr, size, dir);
+}
+EXPORT_SYMBOL(__arc_dma_cache_sync);
diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c
new file mode 100644
index 000000000000..52518b6d0f28
--- /dev/null
+++ b/arch/arc/mm/ioremap.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program 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.
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <asm/cache.h>
+
+void __iomem *ioremap(unsigned long paddr, unsigned long size)
+{
+        unsigned long vaddr;
+        struct vm_struct *area;
+        unsigned long off, end;
+        const pgprot_t prot = PAGE_KERNEL_NO_CACHE;
+
+        /* Don't allow wraparound or zero size */
+        end = paddr + size - 1;
+        if (!size || (end < paddr))
+                return NULL;
+
+        /* If the region is h/w uncached, nothing special needed */
+        if (paddr >= ARC_UNCACHED_ADDR_SPACE)
+                return (void __iomem *)paddr;
+
+        /* An early platform driver might end up here */
+        if (!slab_is_available())
+                return NULL;
+
+        /* Mappings have to be page-aligned, page-sized */
+        off = paddr & ~PAGE_MASK;
+        paddr &= PAGE_MASK;
+        size = PAGE_ALIGN(end + 1) - paddr;
+
+        /*
+         * Ok, go for it..
+         */
+        area = get_vm_area(size, VM_IOREMAP);
+        if (!area)
+                return NULL;
+
+        area->phys_addr = paddr;
+        vaddr = (unsigned long)area->addr;
+        if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) {
+                vfree(area->addr);
+                return NULL;
+        }
+
+        return (void __iomem *)(off + (char __iomem *)vaddr);
+}
+EXPORT_SYMBOL(ioremap);
+
+void iounmap(const void __iomem *addr)
+{
+        if (addr >= (void __force __iomem *)ARC_UNCACHED_ADDR_SPACE)
+                return;
+
+        vfree((void *)(PAGE_MASK & (unsigned long __force)addr));
+}
+EXPORT_SYMBOL(iounmap);
diff --git a/arch/arc/plat-arcfpga/include/plat/dma_addr.h b/arch/arc/plat-arcfpga/include/plat/dma_addr.h
new file mode 100644
index 000000000000..0e963431b729
--- /dev/null
+++ b/arch/arc/plat-arcfpga/include/plat/dma_addr.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program 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.
+ *
+ * vineetg: Feb 2009
+ *  -For AA4 board, kernel to DMA address APIs
+ */
+
+/*
+ * kernel addresses are 0x800_000 based, while Bus addr are 0 based
+ */
+
+#ifndef __PLAT_DMA_ADDR_H
+#define __PLAT_DMA_ADDR_H
+
+#include <linux/device.h>
+
+static inline unsigned long plat_dma_addr_to_kernel(struct device *dev,
+                                                    dma_addr_t dma_addr)
+{
+        return dma_addr + PAGE_OFFSET;
+}
+
+static inline dma_addr_t plat_kernel_addr_to_dma(struct device *dev, void *ptr)
+{
+        unsigned long addr = (unsigned long)ptr;
+        /*
+         * To Catch buggy drivers which can call DMA map API with kernel vaddr
+         * i.e. for buffers alloc via vmalloc or ioremap which are not
+         * gaurnateed to be PHY contiguous and hence unfit for DMA anyways.
+         * On ARC kernel virtual address is 0x7000_0000 to 0x7FFF_FFFF, so
+         * ideally we want to check this range here, but our implementation is
+         * better as it checks for even worse user virtual address as well.
+         */
+        if (likely(addr >= PAGE_OFFSET))
+                return addr - PAGE_OFFSET;
+
+        BUG();
+        return addr;
+}
+
+#endif