[PATCH] m68k: Add the generic dma API functions
Roman Zippel [Sun, 25 Jun 2006 12:46:56 +0000 (05:46 -0700)]
Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/m68k/apollo/Makefile
arch/m68k/kernel/Makefile
arch/m68k/kernel/dma.c [new file with mode: 0644]
drivers/scsi/sun3x_esp.c
include/asm-m68k/dma-mapping.h
include/asm-m68k/scatterlist.h

index 39264f3..76a0579 100644 (file)
@@ -2,4 +2,4 @@
 # Makefile for Linux arch/m68k/amiga source directory
 #
 
-obj-y          := config.o dn_ints.o dma.o
+obj-y          := config.o dn_ints.o
index 458925c..dae6097 100644 (file)
@@ -9,8 +9,8 @@ else
 endif
 extra-y        += vmlinux.lds
 
-obj-y          := entry.o process.o traps.o ints.o signal.o ptrace.o \
-                       sys_m68k.o time.o semaphore.o setup.o m68k_ksyms.o
+obj-y  := entry.o process.o traps.o ints.o dma.o signal.o ptrace.o \
+          sys_m68k.o time.o semaphore.o setup.o m68k_ksyms.o
 
 obj-$(CONFIG_PCI)      += bios32.o
 obj-$(CONFIG_MODULES)  += module.o
diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c
new file mode 100644 (file)
index 0000000..fc449f8
--- /dev/null
@@ -0,0 +1,129 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#undef DEBUG
+
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/vmalloc.h>
+
+#include <asm/pgalloc.h>
+#include <asm/scatterlist.h>
+
+void *dma_alloc_coherent(struct device *dev, size_t size,
+                        dma_addr_t *handle, int flag)
+{
+       struct page *page, **map;
+       pgprot_t pgprot;
+       void *addr;
+       int i, order;
+
+       pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
+
+       size = PAGE_ALIGN(size);
+       order = get_order(size);
+
+       page = alloc_pages(flag, order);
+       if (!page)
+               return NULL;
+
+       *handle = page_to_phys(page);
+       map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
+       if (!map) {
+               __free_pages(page, order);
+               return NULL;
+       }
+       split_page(page, order);
+
+       order = 1 << order;
+       size >>= PAGE_SHIFT;
+       map[0] = page;
+       for (i = 1; i < size; i++)
+               map[i] = page + i;
+       for (; i < order; i++)
+               __free_page(page + i);
+       pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
+       if (CPU_IS_040_OR_060)
+               pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
+       else
+               pgprot_val(pgprot) |= _PAGE_NOCACHE030;
+       addr = vmap(map, size, flag, pgprot);
+       kfree(map);
+
+       return addr;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *dev, size_t size,
+                      void *addr, dma_addr_t handle)
+{
+       pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
+       vfree(addr);
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+inline void dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
+                                      enum dma_data_direction dir)
+{
+       switch (dir) {
+       case DMA_TO_DEVICE:
+               cache_push(handle, size);
+               break;
+       case DMA_FROM_DEVICE:
+               cache_clear(handle, size);
+               break;
+       default:
+               if (printk_ratelimit())
+                       printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
+               break;
+       }
+}
+EXPORT_SYMBOL(dma_sync_single_for_device);
+
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nents,
+                           enum dma_data_direction dir)
+{
+       int i;
+
+       for (i = 0; i < nents; sg++, i++)
+               dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
+}
+EXPORT_SYMBOL(dma_sync_sg_for_device);
+
+dma_addr_t dma_map_single(struct device *dev, void *addr, size_t size,
+                         enum dma_data_direction dir)
+{
+       dma_addr_t handle = virt_to_bus(addr);
+
+       dma_sync_single_for_device(dev, handle, size, dir);
+       return handle;
+}
+EXPORT_SYMBOL(dma_map_single);
+
+dma_addr_t dma_map_page(struct device *dev, struct page *page,
+                       unsigned long offset, size_t size,
+                       enum dma_data_direction dir)
+{
+       dma_addr_t handle = page_to_phys(page) + offset;
+
+       dma_sync_single_for_device(dev, handle, size, dir);
+       return handle;
+}
+EXPORT_SYMBOL(dma_map_page);
+
+int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
+              enum dma_data_direction dir)
+{
+       int i;
+
+       for (i = 0; i < nents; sg++, i++) {
+               sg->dma_address = page_to_phys(sg->page) + sg->offset;
+               dma_sync_single_for_device(dev, sg->dma_address, sg->length, dir);
+       }
+       return nents;
+}
+EXPORT_SYMBOL(dma_map_sg);
index cc990be..2e2c1eb 100644 (file)
@@ -332,11 +332,11 @@ static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
     struct scatterlist *sg = sp->SCp.buffer;
 
     while (sz >= 0) {
-           sg[sz].dvma_address = dvma_map((unsigned long)page_address(sg[sz].page) +
+           sg[sz].dma_address = dvma_map((unsigned long)page_address(sg[sz].page) +
                                           sg[sz].offset, sg[sz].length);
            sz--;
     }
-    sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dvma_address);
+    sp->SCp.ptr=(char *)((unsigned long)sp->SCp.buffer->dma_address);
 }
 
 static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, Scsi_Cmnd *sp)
@@ -350,14 +350,14 @@ static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, Scsi_Cmnd *sp)
     struct scatterlist *sg = (struct scatterlist *)sp->buffer;
                         
     while(sz >= 0) {
-        dvma_unmap((char *)sg[sz].dvma_address);
+        dvma_unmap((char *)sg[sz].dma_address);
         sz--;
     }
 }
 
 static void dma_advance_sg (Scsi_Cmnd *sp)
 {
-    sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dvma_address);
+    sp->SCp.ptr = (char *)((unsigned long)sp->SCp.buffer->dma_address);
 }
 
 static int sun3x_esp_release(struct Scsi_Host *instance)
index dffd59c..4f8575e 100644 (file)
@@ -1,11 +1,63 @@
 #ifndef _M68K_DMA_MAPPING_H
 #define _M68K_DMA_MAPPING_H
 
+struct scatterlist;
 
-#ifdef CONFIG_PCI
-#include <asm-generic/dma-mapping.h>
-#else
-#include <asm-generic/dma-mapping-broken.h>
-#endif
+static inline int dma_supported(struct device *dev, u64 mask)
+{
+       return 1;
+}
+
+static inline int dma_set_mask(struct device *dev, u64 mask)
+{
+       return 0;
+}
+
+extern void *dma_alloc_coherent(struct device *, size_t,
+                               dma_addr_t *, int);
+extern void dma_free_coherent(struct device *, size_t,
+                             void *, dma_addr_t);
+
+extern dma_addr_t dma_map_single(struct device *, void *, size_t,
+                                enum dma_data_direction);
+static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
+                                   size_t size, enum dma_data_direction dir)
+{
+}
+
+extern dma_addr_t dma_map_page(struct device *, struct page *,
+                              unsigned long, size_t size,
+                              enum dma_data_direction);
+static inline void dma_unmap_page(struct device *dev, dma_addr_t address,
+                                 size_t size, enum dma_data_direction dir)
+{
+}
+
+extern int dma_map_sg(struct device *, struct scatterlist *, int,
+                     enum dma_data_direction);
+static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+                               int nhwentries, enum dma_data_direction dir)
+{
+}
+
+extern void dma_sync_single_for_device(struct device *, dma_addr_t, size_t,
+                                      enum dma_data_direction);
+extern void dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
+                                  enum dma_data_direction);
+
+static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
+                                          size_t size, enum dma_data_direction dir)
+{
+}
+
+static inline void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
+                                      int nents, enum dma_data_direction dir)
+{
+}
+
+static inline int dma_mapping_error(dma_addr_t handle)
+{
+       return 0;
+}
 
 #endif  /* _M68K_DMA_MAPPING_H */
index d7c9b5c..8e61226 100644 (file)
@@ -2,18 +2,17 @@
 #define _M68K_SCATTERLIST_H
 
 struct scatterlist {
-       /* These two are only valid if ADDRESS member of this
-        * struct is NULL.
-        */
        struct page *page;
        unsigned int offset;
-
        unsigned int length;
 
-       __u32 dvma_address; /* A place to hang host-specific addresses at. */
+       __u32 dma_address;      /* A place to hang host-specific addresses at. */
 };
 
 /* This is bogus and should go away. */
 #define ISA_DMA_THRESHOLD (0x00ffffff)
 
+#define sg_dma_address(sg)     ((sg)->dma_address)
+#define sg_dma_len(sg)         ((sg)->length)
+
 #endif /* !(_M68K_SCATTERLIST_H) */